Adding a github action which will automatically add "GSSOC21" label to the issue

[satyampgt4]

Is your feature request related to a problem? Please describe. Adding labels to the issues are extra work for the maintainer, so we can add GitHub actions to reduce the work of maintainers

Describe the solution you'd like A clear and concise description of what you want to happen.

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Are you working on this? (Yes/No) yes

[satyampgt4]

@ayan-biswas0412 I would like to work on this issue as a part of GSSOC21

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.