Add coala configuration file and add script in package.json

[rahulrana95]

Fixes #13

Description

You run the linter from terminal by running npm run lint Make sure you have python >=3.4 A few sentences describing the change

Screenshot Before Change:

Screenshot After Change:

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [x] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Non Functional Requirement

• [ ] Follows the code style of this project.
• [ ] Tests Cover Changes
• [x] I have performed a self-review of my own code
• [ ] All new and existing tests passed.
• [x] Documentation

[aashutoshrathi]

Sure. also resolve conflicts.

[rahulrana95]

@aashutoshrathi Made the changes. Please approve PR