feat: add gale shapley algorithm

[Mastermind-sap]

Description of Change

Added gale shapley algorithm to find stable matching. Did not find a directory for game theory so added it in graph subdirectory.

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

[github-actions]

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