DNM: example PR to show how to add a new RBAC resource

[johnstcn]

1. In coderd/rbac/policy/policy.go, add your resources and action definitions.
2. Run make gen to generate codersdk/rbacresources_gen.go
3. Update roles in coderd/rbac/roles.go and ensure tests in coderd/rbac pass
4. Add database tables & authorization
5. Add API routes & authorization
6. Add tests

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_{Last updated for commit 16d0869. This comment will update as new commits are pushed.}

[johnstcn]

Thanks @Emyrk @dannykopping ! Closing this out.