Add 1990/scjones/try.sh

The script allows one to more easily see (and verify) what the entry
does. This involves a temporary file that is created (and removed at the
end of the script but which has also been added to .gitignore).

1990/scjones/.gitignore

@@ -7,3 +7,4 @@ indent.o
 prog.orig
 scjones
 scjones.orig
+scjones.tmp.c