Add 2020/yang/try.sh + format/typo checks

The Makefile also has been updated with a new rule to compile the C++
code the author provided which can preprocess the output of the program
to make it more acceptable to some compilers.

Format/typo check README.md file.

This should complete 2020! There might be another change in another year
but besides that and the YYYY/README.md files the review of all entries
can be mostly considered done (mostly because I will probably do a very
quick pass but this pass is not important one way or another).

thanks-for-help.md

@@ -4459,6 +4459,15 @@ more at home for vi users. One might still end up cursing (see the README.md
 file) but probably a lot less :-)
 
 
+## <a name="2020_yang"></a>[2020/yang](/2020/yang/prog.c) ([README.md](/2020/yang/README.md))
+
+[Cody](#cody) added the [try.sh](/2020/yang/try.sh) script.
+
+Cody also added a make rule (`make cppp`) for the author's provided C++ code
+that can preprocess the generated output to make them more acceptable to typical
+compilers. See the README.md for more details.
+
+
 
 # <a name="general_thanks"></a>General thanks