Establish coding guidelines for framework contributors

[knoepfel]

DUNE US S&C R&D item 064

Coding guidelines should be developed for any code that is to be contributed to the framework. Some guidelines may be general, and others may be specific to the language of the source code.

The guidelines will be stored at https://github.com/Framework-R-D/coding-guidelines.

[knoepfel]

Coding guidelines have been established and documented at https://github.com/Framework-R-D/coding-guidelines.