Added github discussion and updated contributing.md

[Jamir2412]

#446 <CORRESPONDING ISSUE NUMBER> This pull request adds github discussion and update the conrtibuting.md file

Changes

• <ONE> Added github discussion for new contributors to get their queries resolved without create unnecessary GitHub Issues.
• <TWO> Updated contributing.md file to add discussion section.

Flags

• <ONE> Make sure to enable the discussion feature from maintainer's side.

Related Issues

• Issue #446

Author Checklist

• [x] Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [x] Vital features and changes captured in unit and/or integration tests
• [x] Commits messages follow AP format
• [x] Extend the documentation, if necessary
• [x] Merging to master from fork:jamir/i446/added-github-discussion
• [x] Manual accessibility test performed
  • [x] Keyboard-only access, including forms
  • [x] Contrast at least WCAG Level A
  • [x] Appropriate labels, alt text, and instructions

[Jamir2412]

@mttrbrts can you please review my changes ?