Setup codecov.io to measure test coverage

[taranjeet]

🚀 The feature

We need to setup codecov.io to measure code coverage.

Motivation, pitch

As the package is growing, we need to add test for each piece of code. For this we need to measure the coverage right now and then track it from here.

[morgoth9808]

Hey @taranjeet I want to work on this issue

[taranjeet]

Hey @morgoth9808 , assigned it to you.

[morgoth9808]

Hey @taranjeet can you tell me which method should i use to generate the test coverage file I have been using :

coverage run -m pytest

And its generating errors