Implement hands on hp-ignore-file

[MousseDm]

Exercise Review

Exercise Discussion

#58

Checklist

• If you require a new remote repository on the Git-Mastery organization, have you created a request for it?
• Have you written unit tests using repo-smith to validate the exercise grading scheme?
• Have you tested the download script using test-download.sh?
• Have you verified that this exercise does not already exist or is not currently in review?
• Did you introduce a new grading mechanism that should belong to git-autograder?
• Did you introduce a new dependency that should belong to app?

[Copilot]

Pull Request Overview

This PR adds a new hands-on exercise that demonstrates how .gitignore files work in Git. The exercise creates a sandbox repository with a .gitignore file and demonstrates which files are tracked versus ignored.

• Creates a new ignore_file.py module in the hands_on directory
• Sets up a Git repository with a .gitignore that excludes logs/ directory and *.tmp files
• Demonstrates tracked vs. ignored files by creating files that match ignore patterns

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