Code of Conduct file has been added.

[Rutam21]

What does this PR do?

This PR adds the CODE_OF_CONDUCT.md for the domains repository.

Test Plan

This is a standard file and needs no testing

Related PRs and Issues

This PR resolves appwrite/appwrite#2065

Have you read the [Contributing Guidelines on issues]

All Guidelines have been strictly followed.

[Rutam21]

@eldadfux Please review and let me know if everything looks good.

[Rutam21]

@eldadfux Can we get this merged and close the related issue as well, please.

[lohanidamodar]

THANK YOU! All changes merged 🥳

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