Define project written Governance

[qu1queee]

Part of #240

Goal

Adopt a form of Governance model for Project Shipwright. This provides in written form the way the project does things, explicitly.
In addition, it should explain the project roles(from contributors to maintainers), the contributor ladder, values, etc.

Please Consider

CNCF provides three templates for governance, see here. I believe we should adopt the Maintainer Council one.

As part of the Maintainer Council, we need to carefully define the following:

• Values: figure out your actual values
• Becoming a Maintainer: adjust maintainer requirements
• Meetings: fill in with how your project communications actually work
• Code of Conduct: who handles CoC reports?
• Security Response Team: who handles security reports?
• Voting: where do Maintainers take votes?

In addition, I propose to have the specification of roles:

• contributors, approver, maintainer, admins.

Outcome

A PR containing a Governance.md file.