fix .gitignore, Makefile, README.md for 2005/jetro

2005/jetro/README.md

@@ -1,11 +1,29 @@
 # Most sonorous output
 
-Jetro Lauha
-Talonpojantie 5A9,
-00790 Helsinki
-<http://jet.ro>
+    Jetro Lauha
+    Talonpojantie 5A9,
+    00790 Helsinki
+    <http://jet.ro>
 
-## Judges' Comments
+# To build:
+
+```sh
+make
+```
+
+### To run:
+
+```sh
+./jetro
+```
+
+### Try:
+
+```sh
+echo "Do or do not. There is no try."
+```
+
+## Judges' comments:
 
 We have seen entries with SDL graphics in the past, now it's time for SDL
 sound. This entry can even be run on a computer without a sound card with an
@@ -14,17 +32,7 @@ into the SDL documentation.
 
 Can you figure out how the notes are encoded and program a different melody?
 
-### To build
-
-Download and install the portable [Simple DirectMedia Layer library](http://www.libsdl.org/)
-
-       cc -o jetro `sdl-config --cflags --libs` jetro.c
-
-### To run
-
-       ./jetro
-
-## Selected Author's Comments
+## Author's comments:
 
 To compile the entry you need SDL library, which is used only for audio
 output. To run the entry make sure you have audio output available. The entry