Add basic README and fix help from not exiting early

README.md

@@ -1,2 +1,7 @@
 # precompress
 
+A script for "precompressing" static files for use with [Caddy](https://caddyserver.com/).
+
+## Documentation
+
+Run `./precompress help`

precompress

@@ -20,6 +20,7 @@ case "${1:-}" in
  Primarily used for Caddy's file_sever directive's precompresed option.
  It will compress every non brotli, zstandard, or gzip file.
 EOF
+		exit 0
 		;;
 esac