[ENHANCEMENT][DOCS] Requesting a CONTRIBUTING.md

[icarusiftctts]

I suggest adding a CONTRIBUTING.md file that explains how to get started contributing to MicroForge, local validation steps, branching and commit guidelines, and what to include in a PR.

Why this change

• Lowers onboarding friction for new contributors.
• Standardizes how contributors create branches, run local checks, and write PRs.
• Helps maintainers triage contributions more efficiently.

If you agree, I'll add a CONTRIBUTING.md and a PR_TEMPLATE.md.

[ankitadhara28]

Hi maintainer ,
I'd like to work on this issue as a part of SWoC (Season 6).
Please assign it to me.
Thanks !