Add README.md

Author: raghu1213

README.md

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+These instruction are to help you solve a test challenge "Calculate Square". Instruction to this test challenge can be found at https://calculate-square.herokuapp.com/instructions
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+Step by step
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+As per the instruction you have to implement a post endpoint /square
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+- Go to `square.py` under `codeitsuisse/routes` folder in this template and you will find a post method with name  `/square` 
+- write your implementation in this method. This method will be the entry point when you submit your solution for evaluation
+- Note the __init__.py file in each folder. This file makes python treat directories containing it to be loaded in a module
+-