[FEATURE REQUEST] :bookmark_tabs: Create CONTRIBUTING.md

[rafzei]

Is your feature request related to a problem? Please describe. People don't really know how to contribute.

Describe the solution you'd like Create CONTRIBUTING.md (example) as a how-to guide Add in README.md the link and info that we are open to new contributors.

Additional context Consider creating CODE_OF_CONDUCT.md as well

• template generator: https://bttger.github.io/contributing-gen-web/
• may be useful: https://mozillascience.github.io/working-open-workshop/contributing/

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DoD checklist

• Changelog
  • [ ] updated
  • [ ] not needed
• COMPONENTS.md
  • [ ] updated
  • [ ] not needed
• Schema
  • [ ] updated
  • [ ] not needed
• Backport tasks
  • [ ] created
  • [ ] not needed
• Documentation
  • [ ] added
  • [ ] updated
  • [ ] not needed
• [ ] Feature has automated tests
• [ ] Automated tests passed (QA pipelines)
  • [ ] apply
  • [ ] upgrade
  • [ ] backup/restore
• [ ] Idempotency tested
• [ ] All conversations in PR resolved
• [ ] Solution meets requirements and is done according to design doc
• [ ] Usage compliant with license