Add 2020/giles/try.sh, update bugs.md, formatting

The try.sh script does a number of things. First it checks if either
play(1) or aplay(1) are installed. If neither are installed it warns the
user and tells them they will have to play the WAV files manually (it'll
also refer them to the FAQ about SoX which is where play(1) comes from).
If either are installed it'll use that program (in order given above).
After setting that up it converts pi.wav to the digits and then plays
pi.wav (if possible). Then it does the same with jenny (see README.md
for details). Finally it does it for 10666-28 (the closest that
resembles IOCCC-28). It also plays one (if possible, obviously) from
stdin (written from the program).

Updated bugs.md with a limitation the author noted.

Format/typo checked README.md file.

Updated .gitignore.

bugs.md

@@ -3606,6 +3606,17 @@ things that are misinterpreted as bugs. See the
 [troubleshooting.md](2020/ferguson1/troubleshooting.md) files for details.
 
 
+## 2020 giles
+
+### STATUS: INABIAF - please **DO NOT** fix
+### Source code: [2020/giles/prog.c](2020/giles/prog.c)
+### Information: [2020/giles/README.md](2020/giles/README.md)
+
+The author noted that the program only supports WAV files that have
+exactly 16 bits per sample, but it allows any sample rate and any number of
+audio channels.
+
+
 # 2021
 
 There was no IOCCC in 2021.