Initialize BlockCollision Java Project

[pyang4s]

Description:
Set up a new Java project for the BlockCollision desktop game using Swing.

Acceptance Criteria:

• Create new Java project with standard src/ structure
• Add main class: BlockCollision.java
• Add .gitignore for Java
• Add initial README with project name
• Verify project compiles and runs an empty main method
• Push initial commit to GitHub

Estimated Effort: 1 hour