add base governance doc

governance.md

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+# Governance
+
+## Project Maintainers
+[Project maintainers](CODEOWNERS) are responsible for activities around maintaining and updating Duffle, the reference implementation for the [CNAB spec](https://github.com/deislabs/cnab-spec). Final decisions on the project reside with the project maintainers.
+
+Maintainers MUST remain active. If they are unresponsive for >3 months, they will be automatically removed unless a [super-majority](https://en.wikipedia.org/wiki/Supermajority#Two-thirds_vote) of the other project maintainers agrees to extend the period to be greater than 3 months.
+
+New maintainers can be added to the project by a [super-majority](https://en.wikipedia.org/wiki/Supermajority#Two-thirds_vote) vote of the existing maintainers.
+
+A maintainer may step down by submitting an [issue](https://github.com/deislabs/duffle/issues/new) stating their intent.
+
+## Code of Conduct
+This project has adopted the [Microsoft Open Source Code of conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.