Add 2020/otterness/try.sh

The .gitignore was updated but it cannot be sorted because it excludes
'*.mid' but then negates the .mid files in the repo, cvikl.mid and
entertainer.mid. These have to come after the exclusion of '*.mid'. This
is important as one might use the entry to create a .mid file that is
not done in the try script. The make clobber rule does not remove
'*.mid' files as doing so would remove the ones we want to keep.

2020/otterness/.gitignore

@@ -1,8 +1,12 @@
 #
-# sort with: sort -d -u
+# Don't sort because of the exclusion of *.mid with the exception
+# of the cvikl.mid and the entertainer.mid.
 *.dSYM
 indent
 indent.c
 indent.o
 prog
 prog.orig
+*.mid
+!cvikl.mid
+!entertainer.mid