Add initial documents.

README.md

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-# cri-containerd
+# cri-containerd
+cri-containerd is a [containerd](https://containerd.io/) based implementation of Kubernetes [container runtime interface (CRI)](https://github.com/kubernetes/kubernetes/blob/v1.6.0/pkg/kubelet/api/v1alpha1/runtime/api.proto).
+![cri-containerd](./docs/cri-containerd.png)
+## Current Status
+We are currently working toward an alpha version to be used in conjunction with Kubernetes 1.7. See the [roadmap](./docs/proposal.md#roadmap-and-milestones) for information about current and future milestones.
+## Documentation
+See [here](./docs) for documentation.
+## Contributing
+Interested in contributing? Check out the [documentation](./CONTRIBUTING.md).
+## Kubernetes Incubator
+This is a [Kubernetes Incubator project](https://github.com/kubernetes/community/blob/master/incubator.md). The project was established 2017/4/13. The incubator team for the project is:
+* Sponsor: Dawn Chen ([@dchen1107](https://github.com/dchen1107))
+* Champion: Yuju Hong ([@yujuhong](https://github.com/yujuhong))
+* SIG: [sig-node](https://github.com/kubernetes/community/tree/master/sig-node)
+
+For more information about sig-node, please check out:
+* [community site](https://github.com/kubernetes/community/tree/master/sig-node).
+* Slack: #sig-node
+* Mailing List: https://groups.google.com/forum/#!forum/kubernetes-sig-node
+## Code of Conduct
+Participation in the Kubernetes community is governed by the
+[Kubernetes Code of Conduct](./code-of-conduct.md).