Update README.md

Author: rezwanh001

README.md

@@ -5,7 +5,7 @@ This repository contains python programming with data structures and algorithms.
 ## Table of Contents
  -----
 
-- 1.Introduction
+- 1. Introduction
 
     - [Hello Python](https://github.com/rezwanulhaquerezwan/python-programming-with-data-structures-and-algorithms/blob/master/Hello%20Python.py)