Add error message to rwget

bin/rwget

@@ -6,6 +6,7 @@ BASE_CMD="wget -r -c --no-host-directories --no-parent --reject='index.html*'"
 # Let's get the URL first
 if [ "$1" == "" ]; then
 	echo "No url given!" >&2
+	echo "Usage: $0 URL RATELIMIT [USER PASSWORD]" >&2
 	exit 1
 else
 	PARAM_URL="'$1'"