create a mongodb-cheatsheet and updated readme

[crescentpartha]

Descriptions

add a new Cheat Sheet called mongodb-cheatsheet.md file

Expected behavior

Enrich the mongodb-cheatsheet.md file.

Screenshots or Links

If applicable, add screenshots or a modified UI link to help explain your contribution.

Additional Context

Please, directly create a pull request and @mention your pull request id here like #150

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[github-actions[bot]]

It's great having you contribute to this project

Welcome to the community :nerd_face: :rocket:

Thanks for joining our community - we help and encourage each other to contribute to open source little and often 🤓 . Any questions let us know.

[crescentpartha]

@ritwikdalmia, create a pull request with your last modifications.

[ritwikdalmia]

PR 211 closing this issue