add grammar documentation template

[kendonB]

Add Grammar Documentation Template

Description

This pull request adds a template for grammar documentation (e.g. Mouse.md, Text_Manipulation.md, and Bringme.md).

Related Issue

None.

Motivation and Context

There was a lot of style inconsistency in the documentation and this pull request aims to prevent that. It provides a template for adding new documentation, as well as defining some style conventions (subject to change upon discussion). In particular, it asks that can phrases be referred to using italics and variables in the command phrase spec be referred to using backticks.

How Has This Been Tested

No testing yet.

Types of changes

• Docs change / refactoring / dependency upgrade
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have checked that my code does not duplicate functionality elsewhere in Caster.
• My code implements all the features I wish to merge in this pull request.

Maintainer/Reviewer Checklist

• Basic functionality has been tested and works as claimed.
• New documentation is clear and complete.
• Code is clear and readable.

[kendonB]

I'll also make changes to CONTRIBUTING.md once we have settled on this style as the way to go and this has been merged.