Adds a 'Hello World' Python Challenge

Author: monoprosito

Python/README.md

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 # HackerRank Challenges about Python programming language
 
 - A Very Big Sum: [Challenge](https://www.hackerrank.com/challenges/a-very-big-sum/problem) - [Solution](https://github.com/monoprosito/hackerrank_challenges/tree/master/Python/a_very_big_sum)
+- Say "Hello, World!" with Python: [Challenge](https://www.hackerrank.com/challenges/py-hello-world/problem) - [Solution](https://github.com/monoprosito/hackerrank_challenges/tree/master/Python/say_hello_world_with_python)

Python/say_hello_world_with_python/README.md

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+### Problem
+
+Here is a sample line of code that can be executed in Python: 
+
+```python3
+print("Hello, World!")
+```
+
+You can just as easily store a string as a variable and then print it to stdout: 
+
+```python3
+my_string = "Hello, World!"
+print(my_string)
+```
+
+The above code will print Hello, World! on your screen. Try it yourself in the editor below!
+
+### Input Format
+
+You do not need to read any input in this challenge.
+
+### Output Format
+
+Print Hello, World! to stdout.
+
+### Sample Output 0
+
+```
+Hello, World!
+```
+
+**Author:** [Shashank Sharma](https://www.hackerrank.com/profile/shashank21j)
+
+**Difficulty:** Easy
+
+**Max Score:** 5

Python/say_hello_world_with_python/say_hello_world.py

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+if __name__ == '__main__':
+    print('Hello, World!')