Adding a Multi-Player Chess Project

**Project title**
Multi-Player Chess Application

**Project Description**
A simple chess game implementation using Vanilla JavaScript.

Implemented Features :
- Show possible moves when a piece is selected
- Pieces can only make valid moves
- Pieces can only take opponent pieces
- Toggle turns after each move (white being the first)

Stack:
[✔] Html
[✔] CSS
[ ✔] JavaScript