Update README.md

Author: phillipai

Diff for: day22/README.md

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 # Day 22 - Build Pong: The Famous Arcade Game
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+## Concepts Practised
+- Create a Paddle that responds to Key Presses
+- Write the Paddle Class and Create the Second Paddle
+- Write the Ball Class and Make the Ball Move
+- Add the Ball Bouncing Logic
+- How to Detect Collisions with the Paddle
+- How to Detect when the Ball goes Out of Bounds
+- Score Keeping and Changing the Ball Speed
 ## Pong
-
 ![day22](https://user-images.githubusercontent.com/98851253/154784268-637ac016-6603-427c-8390-1d12a1cb3fe2.gif)