OS the preview project

[Emyrk]

Requirements

• add README
• add Contributing
• ensure all tests are passing even for Wordle (or exclude this test case)
• tests should be run-able locally without terraform provier
  • TF Provider updated feat: form_type and styling metadata arguments added terraform-provider-coder#375
• documentation (Edward) to review README
• merge TF changes into TF Provider
• flip switch on repo

[stirby]

Putting on pause until we have parity with coder/coder.

[Kira-Pilot]

@Emyrk what do we mean by 'testing'? Seems like this should be baked into the other tickets more iteratively.