new lesson: 2 Pointer Method in Arrays

### ⭐ Request Type

Would like to add a lesson to illustrate the use of the 2-pointer method algorithm.  It would include the following
1.  Working of the algorithm.
2. Time Complexity Analysis.
3.  Situations where we can use the algorithm.
4.  Some practice questions.

### 💻 Location

section: 4
lesson: E
order: 4E
filename: two-pointer.md

### ❌ Additional Info

_No response_