Create documentation for MFractors Xamarin.Forms color actions.

[matthewrdev]

These should be placed under the category:

• Xamarin.Forms -> Colors -> code-actions.md

This document should include the following refactorings:

• Add transparency channel to color.
• Convert named color to hex.
• Edit color using color editor.

[ravero]

Published here.

[matthewrdev]

@ravero 🙏🙏