Creating Shannon Entropy calculation function and editing test datasets

[willdavidson05]

Description

This PR introduces an entropy.py module that computes the Shannon Entropy, based on the output from (calculate_loc_changes) in git_parser.py.

Within the module, safeguards were used to ensure that probability values cannot be negative. Additionally, a test suite test_entropy.py has been created to validate against negative outputs.

The test datasets were edited to have multiple files in a repository, this is done in the high_entropy repo. To support repositories with multiple files, modifications were made to (calculate_loc_changes) in git_parser.py. It now accepts an additional parameter, file_names: list[str].

The new test repository structure is as follows:

• High_Entropy

  • high_entropy.md
  • Baseline Content (commit 1)
  • Added Entropy (commit 2)
  • high_entropy2.md
  • Baseline content (commit 1)

• Low_Entropy

  • Low_entropy.md
  • Baseline content (commit 1)
  • Added entropy (commit 2)

I appreciate any comments or feedback!

Closes #62 , #64

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• [ ] Bug fix (fixes an issue).
• [x] Enhancement (adds functionality).
• [ ] Breaking change (these changes would cause existing functionality to not work as expected).

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