Bootstraped the standards for "Files and Directories"
Added some suggestions and fixed one minor formatting issue
feature #3901 Bootstraped the standards for "Files and Directories" (javiereguiluz)

This PR was merged into the 2.3 branch.

Discussion
----------

Bootstraped the standards for "Files and Directories"

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | 2.3+
| Fixed tickets | -

This is just a draft. I really need your comments and suggestions to decide the best standards for this.

Commits
-------

a107884 Added some suggestions and fixed one minor formatting issue
7843fe6 Bootstraped the standards for "Files and Directories"