Add ROADMAP.md file

[qu1queee]

Is there an existing feature request for this?

• I have searched the existing feature requests

Is your feature request related to a problem or use-case? Please describe.

No

Describe the solution that you would like.

Create a ROADMAP.md that contains information about the following:

• Items want to achieve
• Items we have
• Items we think are important, with no deadline attached.

See example https://github.com/ko-build/ko/blob/main/ROADMAP.md. We need to ensure this document is reviewed periodically.

Describe alternatives you have considered.

No response

Anything else?

No response