new lesson: Subarrays

[Utkarsh1504]

⭐ Request Type

Add notes for the lesson Subarrays.
you can start your contribution from this file

Topic:

1. Introduction
2. some problems on subarrays
3. Two Pointers Algorithm
4. Sliding Window

💻 Location

This file is at:
section: 4
lesson: E
order: 4E
file-name: subarrays.md

❌ Additional Info

No response

[Utkarsh1504]

This one is already taken by someone please work on the other issues I'll be opening more, don't worry!

[Kajal13081]

Hey @Utkarsh1504 assign me this issue please.