Added Testing information for Devs in README.md (#97)

Author: iamrajiv

README.md

@@ -27,8 +27,16 @@ python3 setup.py develop
 
 Make sure that your python version is above `3.5`.
 
+Testing
+-------
+
+For testing your patch locally follow the steps given below,
+
+1. Install [pytest-cov](https://pypi.org/project/pytest-cov/). Skip this step if you are already having the package.
+2. Run, `python3 -m pytest --doctest-modules --cov=./ --cov-report=html`. Look for, `htmlcov/index.html` and open it in your browser, which will show the coverage report. Try to ensure that the coverage is not decreasing by less than 1% for your patch.
+
 Why we use Python?
------------------
+------------------
 
 As we know Python is an interpreted language and hence is slow as compared to C++, the most
 popular language for sports programming. We still decided to use Python because the software