put all README.md files under CC BY-SA 4.0 License

This will make is easier for others to share README.md
files while requiring them to attribute the file
when using it.

2001/anonymous/README.md

@@ -157,3 +157,12 @@ like last years entry 'dhyang'; both are just C programs that generate C
 code as their output.
 
 Enjoy, thanks!
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/bellard/README.md

@@ -162,3 +162,11 @@ okay. Thank you Cody for your assistance!
     dynamic linker to resolve symbols with 'dlsym()', so '-ldl' must
     be used as library when you compile it.
 
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/cheong/README.md

@@ -96,3 +96,12 @@ Challenges for the masses:
 
 Thanks goes out to Bobby Rohde for numerous suggestions on how to shorten
 the program.
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/coupard/README.md

@@ -153,3 +153,11 @@ When linting the program with lclint, it complains about a huge list
 of things that, if corrected to make lint happy, would probably double
 the size of the source code.
 
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/ctk/README.md

@@ -58,3 +58,12 @@ leading '-') will silence the sound. It won't work on a terminal
 smaller than 80x24, but it works fine with more (try it in an
 XTerm with the "Unreadable" font and the window maximized
 vertically!).
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/dgbeards/README.md

@@ -224,3 +224,12 @@ M+&\I*3YS/UD]1RQE.G,[(&-H86YG92!T:&4@/B!T;R!A(#X](&%N9"!T:&4@
 38G5G('=I;&P@8F4@9V]N92X*"FYG
 `
 end
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/herrmann1/README.md

@@ -359,3 +359,12 @@ beginning.
 
 - On SunOS, I had to remove the "-q" option from diff in the build
 script.
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/herrmann2/README.md

@@ -237,3 +237,12 @@ generated implicitly. So the build script has to pass "-include
 the include files has to be provided. In the build script, I
 assume that the path is /usr/include, but this can easily be
 adapted.
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/jason/README.md

@@ -128,3 +128,12 @@ in the source code.)
 [GAME STRATEGY SPOILER:  The trick, of course, is to drop items in
 empty rooms to mark them.  That way you usually know if you're in a
 room you've seen before.  It greatly aids mapping.]
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/kev/README.md

@@ -189,4 +189,11 @@ architectures need to have the same character systems (ie. don't
 try mixing ASCII and EBCDIC).  It is independent of endianness
 though.
 
+## Copyright and CC BY-SA 4.0 License:
 
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/ollinger/README.md

@@ -109,3 +109,12 @@ The main loop simply iterates this transition function on each cell.
 "The rest is silence" (Hamlet, V.2)
 
 Enjoy!
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/rosten/README.md

@@ -151,3 +151,12 @@ ERRORS
     can't compile the code. It thinks that preprocessor lines can not have
     whitespace preceding the #. Moving the preprocessor directives to the
     beginning of the line wrecks the layout but makes it compile.
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/schweikh/README.md

@@ -81,3 +81,12 @@ straightforward; for '*' start out with '*foo' and 'foo*' against 'foo'.
 How does it deal with sequences of adjacent `*'? How could this be
 improved? If all else fails, recode the ?: operators with if/else and
 try again. For extra credit implement character classes like [a-z].
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/westley/README.md

@@ -181,3 +181,12 @@ all legal C.
 
 *except in Florida voting machines
 **all cards must be face down, nine-edge first, of course.
+
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/

2001/williams/README.md

@@ -64,3 +64,11 @@ arithmetic, resulting in the overuse of bitwise shift operators.
 Another example is (x|1), which is used in a couple different ways.
 The purpose of A/(x|1) is probably obvious, but what does (x|1)%2 do?
 
+## Copyright and CC BY-SA 4.0 License:
+
+This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.
+You are free to share and adapt this file under the terms this license:
+
+    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+For more information, see: https://creativecommons.org/licenses/by-sa/4.0/