Code style guide

[nthprt]

This issue is focused on creating and adopting a code style guide for the KrySBAS package.

[gusespinola]

I've noticed that I hadn't the chance of thank You for this upload to the repository, because it does occurred during our conversations. In this particular case, it's good to remember the best practices of code styling that we've defined at the project start, they were of implicit usage and weren't well documented in here.