created python3 branch and added first solution

Author: arsho

Introduction/SayHelloWorldWithPython.py

@@ -3,14 +3,7 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 23 July 2018
 Problem   : https://www.hackerrank.com/challenges/py-hello-world/problem
 '''
-#This is a single line comment
-'''
-This is 
-a 
-multiline comment
-'''
-#write your code in next line. 
-print "Hello World!"
+print("Hello, World!")