📚 [Documentation] - Adding Auto_comment.yml file

[Anshika-Jain02]

Description of the documentation deficiency / workflow suggestion. ✍🏻

We need to add an auto-comment.yml that will automatically welcome, greet and provide necessary information to the contributors when they create new issues, PR, and when these will get assigned or merged respectively. This will promote motivation and performance

@praveenscience Please assign me this issue under gssoc'23

Contributor terms

• [X] I agree to follow the Contributing Instructions

[github-actions[bot]]

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