Adding standards to documentation

[khgaw]

Summary of PR:

This PR adds the coding standards to the documentation

What issues does this PR close:

Documentation

What files were changed and what changes were made?

Community.rst - Add a community guidelines section of the documentation Standards.rst - Contains coding standards, math standards, and abbreviations index.rst - Add Community.rst

Does your PR (check all that applies):

• [x] Add documentation
• [x] Change/Remove documentation
• [ ] Add tests
• [ ] Change/Remove tests
• [ ] Add code
• [ ] Change/Remove code
• [ ] Fix formatting

Are there any errors/relevant logs in your code?

No

How has this been tested?

Run sphinx

[cadop]

This should probably be in the refactor, as the current code doesn't use the matrices and such