Added copyright and license section to readme

README.md

@@ -1,6 +1,28 @@
 # Simple JS Snake
+
+## Description
+
 My own version of the classic game Snake written in JavaScript.
 
 I made this to try object-oriented JavaScript. This is an old project and it's terrible, unobtimized, the controls suck, and the sound effects were generated in [sfxr](https://www.drpetter.se/project_sfxr.html).
 
-### You can play the game at https://games.clb92.xyz/snake/
+#### You can play the game at https://games.clb92.xyz/snake/
+
+## License
+
+### GNU General Public License v3.0
+
+Copyright (c) 2021 clb92
+
+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
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.