improve -Add the README.md file.

Author: phoenix-deb

README.md

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+# DSA with Python
+
+## About
+**Data Structure and Algorithm with Python** 
+
+This repository has an implementation of the algorithms and data structures with Python. I made this repository for fun and it started while I solved the *lletcode* problems and I thought it was going to be helpful for others, especially students.
+
+All of the algorithms and data structures have a test, and I wrote tests with *pytest*.
+
+## Contribute to DSA with Python
+There are many diiferent ways to contribute to this repository, actually because I started this repository for fun and I'm working on it for fun, so you just can check the respository and if you find a bug or some better solution for any of these files, just make an issue and describe it the bug or the reason and work on it.
+
+**Steps:**
+
+1. Create an issue
+2. Fork the repository
+3. Work on the problem
+4. Create a pull request(PR) 
+
+## Challenges / Problems
+As I said, I started the repository while solving the *Leetcode and Hackerrank* problems/challenges, so I pushed some of the problems I solved on these websites. So that you can find these in [problems](https://github.com/mohammadpagard/python-algorithm/tree/main/problems) .