Add a Code of Conduct

[Adibakhan14]

To ensure a welcoming and inclusive environment for all contributors, I propose adding a Code of Conduct to the ml4e project. A Code of Conduct helps set the tone for collaboration and outlines the expected standards of behavior within the community.

Benefits:
-Promotes a respectful and harassment-free space for contributors.
-Clarifies consequences for unacceptable behavior.
-Demonstrates a commitment to diversity and inclusion.

[github-actions]

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