[Docs]: Adding auto-comment.yml file

[Anshika-Jain02]

what's wrong in the documentation?

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

@Susmita-Dey Please assign me this issue under gssoc'23

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👋 @Anshika-Jain02 This issue is closed.