Added screenshots

README.md

-# Game 2048
-
 ## Screenshots of Game Controls
 
 Here are the screenshots showing the directional controls for the game:
 
 ![Up Functions](./screenshots/UPFUNCTIONS.PNG)
-![Down Functions](./screenshots/DOWN.PNG)
-![Left Functions](./screenshots/LEFT.PNG)
-![Right Functions](./screenshots/RIGHT.PNG)
+![Down Functions](./screenshots/DOWNFUNCTIONS.PNG)
+![Left Functions](./screenshots/LEFTFUNCTIONS.PNG)
+![Right Functions](./screenshots/RIGHTFUNCTIONS.PNG)