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.

2020/giles/try.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2020/giles
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+# try and find play(1). Should be available if SoX is installed.
+PLAY="$(type -P play)"
+
+if [[ -z "$PLAY" ]]; then
+    PLAY="$(type -P aplay)"
+    
+    if [[ -z "$PLAY" ]]; then
+	echo "Note: cannot find play(1) or aplay(1). Will not play sounds for you. Try installing" 1>&2
+	echo "SoX. See FAQ 3.10: How do I compile and use an IOCCC winner that requires sound?" 1>&2
+	echo 1>&2
+	echo "You will have to play the WAV output manually, sorry." 1>&2
+	echo 1>&2
+    fi
+fi
+
+read -r -n 1 -p "Press any key to convert pi.wav to its digits: "
+echo 1>&2
+echo "$ ./prog < pi.wav" 1>&2
+./prog < pi.wav
+if [[ -n "$PLAY" ]]; then
+    read -r -n 1 -p "Press any key to play pi.wav with $PLAY: "
+    echo 1>&2
+    echo "$ $PLAY pi.wav" 1>&2
+    "$PLAY" pi.wav
+fi
+
+read -r -n 1 -p "Press any key convert 867-5309: "
+echo 1>&2
+echo "$ ./prog 867-5309 > jenny.wav" 1>&2
+./prog 867-5309 > jenny.wav
+if [[ -n "$PLAY" ]]; then
+    read -r -n 1 -p "Press any key to play jenny.wav with $PLAY: "
+    echo 1>&2
+    echo "$ $PLAY jenny.wav" 1>&2
+    "$PLAY" jenny.wav
+    echo 1>&2
+    read -r -n 1 -p "Press any key to play 10666-28 ('IOCCC-28'): "
+    echo 1>&2
+    echo "$ ./prog 10666-28 | $PLAY -"
+    ./prog 10666-28 | "$PLAY" -
+else
+    echo 1>&2
+    echo "Now try playing jenny.wav with an audio player that can play WAV files."
+    echo 1>&2
+    read -r -n 1 -p "Press any key to convert 10666-28 ('IOCCC-28'): "
+    echo 1>&2
+    echo "$ ./prog 10666-28 > ioccc28.wav"
+    ./prog 10666-28 > ioccc28.wav
+    echo 1>&2
+    echo "Now try playing ioccc28.wav with an audio player that can play WAV files."
+fi