Creating guidelines for contributing demos

[macruzbar]

Adding guidelines for gRPC community to contribute demos for the community meetup.
@thisisnotapril can you please help me to give this file some visibility? Thank you!

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[macruzbar]

/assign @thisisnotapril

April, can you help me to give more visibility to this PR? Please feel free to add other reviewers

[chalin]

Hi @macruzbar: I suggest that we add new content to CONTRIBUTING.md. The CONTRIBUTING.md page is in need of review, would you like for me to consider adding your demo-related prose to that file when I review it?

[jsoref]

@chalin how dead is this repository?

The CONTRIBUTING file suggests master but that's gone...
https://github.com/grpc/grpc-community/blob/main/CONTRIBUTING.md?plain=1#L29-L30

This suggests PRs will be closed in 2-3 weeks, but the only two PRs have been open for a very long time:

grpc-community/CONTRIBUTING.md

Line 27 in bf53bac

* Unless your PR is trivial, you should expect there will be reviewer comments that you'll need to address before merging. We expect you to be reasonably responsive to those comments, otherwise the PR will be closed after 2-3 weeks of inactivity.

(I have a PR I'd be likely to make, but if this repository is dead, ...)