chore(license): Add AGPL v3 licensing

[Prajna1999]

Issue

Closes #1171

Summary

• Add AGPL v3 as the licensing agreement for this repo.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

Original PR description

Issue

Closes #1171

Summary

Explain the motivation for making this change. What existing problem does the pull request solve?

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

Notes

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[Ayush8923]

already reviewed the backend PR and added some comments there. so please check those comment and address those comment in this PR also.
here is the backend PR: ProjectTech4DevAI/kaapi-backend#1164