wip(poly create with docs): create README and interface docstring when creating a brick

[DavidVujic]

Description

New feature:

• creating a README when creating a component or a base, this is configurable in workspace.toml
• Adding a brick docstring when passing in a --description with the poly create command

Motivation and Context

Solves suggestions in #48

How Has This Been Tested?

CircleCI ✅
Manual tests:
Installed locally and created components and bricks with the brick-docs config enabled and disabled.
Tested for both "tdd" and "loose" theme.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the code of conduct.
• I have read the contributing guide.
• I have updated the documentation accordingly (if applicable).