docs: Add CONTRIBUTING.md

[Harsh-Microsoft]

Purpose

This pull request includes an update to the CONTRIBUTING.md file to provide guidelines for contributing to the project. The changes include instructions on agreeing to a Contributor License Agreement (CLA) and adopting the Microsoft Open Source Code of Conduct.

Key changes:

• Added a section detailing the requirement to agree to a Contributor License Agreement (CLA) when making contributions.
• Included information about the CLA-bot that helps automate the CLA process.
• Adopted the Microsoft Open Source Code of Conduct and provided links for more information and contact details.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on GitHub release

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