Create year folder structure for college lab organization

[Copilot]

This PR implements the requested folder structure to organize college lab content by academic year.

Changes Made

Added four new directories to organize lab materials by academic year:

• year 1/ - For first year college lab content
• year 2/ - For second year college lab content
• year 3/ - For third year college lab content
• year 4/ - For fourth year college lab content

Each directory includes a .gitkeep file to ensure the folders are tracked by Git even when empty, allowing future lab content to be organized appropriately.

Repository Structure

The repository now has the following structure:

collegeLab/
├── README.md
├── year 1/
├── year 2/
├── year 3/
└── year 4/

This organization will make it easier for students and instructors to navigate lab materials based on their current academic year and maintain a clear separation of content by difficulty level and curriculum progression.

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