Correct the mentioned pylint errors to get perfect 10. (missing-docstring)

[LordGameleo]

We are currently using a customized checklist for pylint. We have disabled a lot of checks to make our build successfully. We want to counter these checks few at a time. This issue deals with one of them.

How to produce:

After forking and cloning this repo, make a branch named develop-Pylint_docstring using
git branch develop-Pylint_docstring

Checkout branch by
git checkout develop-Pylint_docstring

remove missing-docstring, from .pylintrc file (line 24)

Check pylint errors using
pylint * on terminal (in the repo)

Add doc strings to get a perfect 10 score on pylint.

[LordGameleo]

@Rechi @razzeee Please add first timers only and help wanted label

[ajaykhgupta]

Hey, Can you assign this issue to me.
Also would like to know what docstring is it just to define the usage of class?

[razzeee]

It's the description of a method or class