Add PHPCS Github Action

[w3bdesign]

With Wordpress coding standards by default

[w3bdesign]

@DevinVinson

[smileBeda]

@w3bdesign - I have revamped the Boilerplate to WPCS compliance here https://github.com/TukuToi/better-wp-plugin-boilerplate
But how would I add your PR to Git?
I am eager to do so, or accept your PR there, or contribution.

I just don't know how to add it to Git, I am using it on my local IDE instead.

[w3bdesign]

@TukuToi

Take a look at TukuToi/better-wp-plugin-boilerplate#4