message: Add integration criteria to README.
diff: Tectonic Console
  ================
  +
  +# External Service Integration Criteria
  +
  +Any external service that integrates with console should satisfy the following requirements:
  +
  +- The service can be installed on a 3 node cluster with 4GB of RAM per node.
  +- The backend will refuse to create invalid resources. (eg: CPU/RAM requests exceeding limits will result in an HTTP 400 code)
  +- API response time is less than 2 seconds for synchronous actions.
  +- Errors and statuses are propagated to the correct k8s objects for async actions.
  +- The service has basic documentation on debugging. (eg: How do we know if the service is working or not?)
  +- Nice to have: Updates to objects finish on the order of seconds, not minutes.
  +- Nice to have: Owned resources have ownerReferences.
  +- There is an agreed-upon API before any console work is started.
  +
  +
  Codename: "Bridge"
  [![Build Status](https://jenkins-tectonic.prod.coreos.systems/buildStatus/icon?job=console-build)](https://jenkins-tectonic.prod.coreos.systems/job/console-build/)
  