Docs/adding first contrib

[that-ar-guy]

PR Summary

fixes : #3097
Added a new file first-contributors-guide.md in docs/license-contributing/ for guiding new contributors so that they can easily onboard to the project and start contributing.

PR Checklist

• PR has a meaningful title
• Summarized changes
• Change is not breaking
• This PR is ready to merge and is not Work in Progress
• Rule changes
  • Unit tests created/ updated
  • Rule documentation created/ updated
  • Link to a filed issue
  • Change log has been updated with change under unreleased section
• Other code changes
  • Unit tests created/ updated
  • Link to a filed issue
  • Change log has been updated with change under unreleased section

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