Add unobfuscated alt code to 2020/otterness

This code was found on the author's web page about the entry and has
been added as prog.alt.c. I added the try.alt.sh script as well.

Manifest updated and rebuilt .entry.json and index.html files.

2020/otterness/try.alt.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC entry 2020/otterness alt code
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+[[ -z "$CC" || ! -f "$CC" || ! -x "$CC" ]] && CC="cc"
+
+make CC="$CC" alt >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+read -r -n 1 -p "Press any key to run: ./prog.alt < cvikl.mid > output.mid: "
+echo 1>&2
+./prog.alt < cvikl.mid > output.mid
+echo "Now play output.wav in an audio player that can play MIDI files." 1>&2
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./prog.alt < entertainer.mid > output2.mid: "
+echo 1>&2
+./prog.alt < entertainer.mid > output2.mid
+echo "Now play output2.wav in an audio player that can play MIDI files." 1>&2
+echo 1>&2