Added mongoose cheatsheet

[RoshaanAli]

Change Summary

Provide summary of changes with issue number if any.

Checklist

If you haven't fulfilled the below requirements or even delete the entire checklist, your PR won't be reviewed and will be closed without notice.

General

• [x] This Pull Request is all my own work. (You'll be blacklisted if you are caught for plagiarism.)
• [x] I've read CONTRIBUTING.md
• [x] I've made some valid changes to the CheatSheet, and they are not just minor changes.

Changes

• [x] I've read and followed the Solution Template

Note: To mark the checkbox, put an x inside the [ ] (like this: [x]).

[netlify[bot]]

✅ Deploy Preview for cheatsheets ready!

Name	Link
🔨 Latest commit	509472b98ef1762d2fec28c37acd862b8962f72e
🔍 Latest deploy log	https://app.netlify.com/sites/cheatsheets/deploys/635fd048f38ed100087a4cf8
😎 Deploy Preview	https://deploy-preview-216--cheatsheets.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[aryankashyap7]

The structure still need some changes, follow the same structure used by other cheat sheets

[Dhravya]

Hey @RoshaanAli, any updates?