Update README.md

README.md

@@ -1,4 +1,5 @@
 # Robot Mazes
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 
 Just a simple python program to implement the game proposed by Erich Friedman
 [Robot Mazes](https://erich-friedman.github.io/puzzle/robot/) and AI capable of solving it.
@@ -62,4 +63,4 @@ This menu allows the user to see the result of the algorithm selected applied to
 
 ## Play
 This menu allows the user to play the game. The user might choose movements by using the arrow keys, start a simultaion with enter, erase movements with backspace and ask for tips by clicking the light bulb.
-![](Readme/img/play.gif)
+![](Readme/img/play.gif)