Feat: Add connect 4 game

[Devdammie]

What I added

• Language: HTML, CSS, JavaScript
• Short description: A classic Connect 4 game playable in a web browser. It features a clean, modern UI and includes two game modes: Player vs. Player and Player vs. Bot. The bot has a simple AI to provide a challenge.
  How to run:
• Navigate to the web/connect-4-game/ directory.
  Open the HTML file directly in your web browser.
  Alternatively, for a better experience, you can use a local web server (like the "Live Server" extension in VS Code) to serve the project folder.

Notes for reviewers

• This is a self-contained project with no external dependencies, making it easy for anyone to run.
  The JavaScript in script.js is a good example of DOM manipulation, game state management, and a simple game AI.