Update README

Author: juho05

README.md

@@ -3,9 +3,15 @@
 
 cg-debug is a simple CLI-based frontend for CodeGame debug endpoints.
 
+## Usage
+
+```
+cg-debug <game_url>
+```
+
 ## License
 
-Copyright (c) 2022 CodeGame Contributors (https://code-game.org/contributors)
+Copyright (c) 2022 Julian Hofmann
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by