Implement project generator

[Ochibueze474]

This PR implements the core project generator requested in issue #1.

• Added generator.py with create_project() function
• Creates a new project folder using os.makedirs()
• Generates starter files inside it: README.md and main.py
• Handles existing directories safely with a try/except FileExistsError,
  printing a clear message instead of crashing
• Tested locally: confirmed folder and files are created correctly, and
  running it again on an existing folder name shows the expected message
  instead of an error

Difficulty: Medium

Note: I commented on the issue before starting but hadn't heard back yet.
Went ahead and built this out, happy to adjust based on any feedback.

Fixes #1