Add Chickpad

[eerraa]

Add Chickpad

Description

The Chickpad is a macro pad powered by the RP2040 microcontroller.
I would greatly appreciate it if you would consider merging this contribution.
Thank you!

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[eerraa]

@waffle87 @zvecr
Thank you for taking the time to review and modify my PR. I appreciate your assistance.