Add checkStyle and pmd for easy conformance to project code style

[pareshchouhan]

Add checkStyle so we can have consistent code style across the project.
pmd is yet another plugin which performs quality checks on java source files.
need a thumbs up so I can add this ;)

[vickychijwani]

Hi @pareshchouhan! Sorry for the late response. I would love to include this.

Does this plugin run automatically as part of every build in Android Studio? I'd prefer to not have it run like that as it would slow down builds somewhat. Can this instead be set to run with Travis CI / Circle CI (#117)?

[pareshchouhan]

yes they can be set to run independently of the main build so this won't slow down the build :)

[vickychijwani]

Sounds good 👍