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/README.md

@@ -12,6 +12,13 @@ make all
 ```
 
 
+## Try:
+
+```sh
+./try.sh
+```
+
+
 ## Judges' remarks:
 
 The addition of trigraphs has made it easier to make programs hard to read.  It