Load graphics in game panel

Create a new GamePanel class load the game graphics in the game panel

assigned to @abhatta5

Design Ideas:

1. Sketch a mockup (Colour Scheme)
2. List down graphics required (Bricks, paddle, ball)

Graphic Ideas:

1. Design graphics from scratch (MS Paint)
2. Optimize graphics for the game (resizing, formatting)

Implementation Ideas:

1. Cass GamePanel
2. To write functions to load the graphics into the game

closed with commit 41a70286