Added Notion cheatsheet

[Haaziq386]

What does this PR do?

Add resource(s)

For resources

Description

Added 3 cheat Sheets for Notion all as html links. The official website link may require sign up (which is free)

Why is this valuable (or not)?

It covers all important documentations related and are recent working links . Sure to come in handy if someone wants to revise notion quickly.

How do we know it's really free?

These are free websites, and no additional subscription or cost is involved.

For book lists, is it a book? For course lists, is it a course? etc.

Website

Checklist:

• [x] Read our contributing guidelines.
• [x] Search for duplicates.
• [x] Include author(s) and platform where appropriate.
• [x] Put lists in alphabetical order, correct spacing.
• [x] Add needed indications (PDF, access notes, under construction).
• [x] Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!