[GitHub Action] add flow for welcoming first-time-contributors

[vishalvivekm]

Description

This PR adds action to welcome contributor on opening their first Pull Request.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[vishalvivekm]

There's some issue with the body, will fix.

Please do not merge

[sudhanshutech]

@vishalvivekm is it done?

[sudhanshutech]

@vishalvivekm ?

[vishalvivekm]

Welcome, @vishalvivekm! Thank you for your first contribution! 🎉 A contributor will be by to give feedback soon. In the meantime, please review the Newcomers' Guide and be sure to join the community Slack.

Be sure to double-check that you have signed your commits.
Here are instructions for making signing an implicit activity while peforming a commit.

[l5io]

🚀 Preview for commit ff47cb2 at: https://66e97d489aca251e66965bfb--layer5.netlify.app

[l5io]

🚀 Preview for commit e0861c7 at: https://66e9820795a9cf12f0e30fd8--layer5.netlify.app

[sudhanshutech]

Welcome, @vishalvivekm! Thank you for your first contribution! 🎉 A contributor will be by to give feedback soon. In the meantime, please review the Newcomers' Guide and be sure to join the community Slack.

Be sure to double-check that you have signed your commits.
Here are instructions for making signing an implicit activity while peforming a commit.

@vishalvivekm its not compatible with dark mode of github.

[sudhanshutech]

@vishalvivekm checkiing again.

[l5io]

🚀 Preview for commit 770d948 at: https://670d211d3d287d30c1b13d62--layer5.netlify.app