Add test policy documentation for OpenSSF Best Practices badge

[archtharu-bit]

This PR addresses the missing OpenSSF Best Practices criteria:\n\n- test_policy: Created docs/TEST_POLICY.md documenting the project's testing policy\n- tests_are_added: Updated CONTRIBUTING.md with testing requirements referencing the test policy\n\nThis will improve the badge from 97% to 100%.

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[archtharu-bit]

Thank you for the given support and would like to work with you in future as well. Never means to delay. This is my first project I was really new, which made me stuck here and there. I will complete the all the requirements as you need. Thanking you and looking forward a reply