Coding standards

[hugosolar]

Description

This commit adds code sniff scripts to test and fix file formatting following the WordPress code Standards.

• Add composer file
• Add sniff scripts and instructions
• Fix format options and file naming conventions following the Wordpress Code Standards
• Add inline documentation following PHP Documentation Standards
• Add contribute instructions
• Add assets from Vocabulary (that should happen in the past commit but I missed it)

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[TimidRobot]

I'm weak at reviewing PHP, but it's obvious there's a lot of good work here!

I recommend the following CalVer version number format: YYYY.0M.Micro (Micro is not zero padded, see https://calver.org/). Version number would be: 2020.04.1.

Badge:

I also think you should link to CONTRIBUTE.md form the README.

[TimidRobot]

very good