Restore DESIGN.md

Author: Harry Zhang

Diff for: DESIGN.md

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+# Kubernetes Overview
+
+See the [user guide overview](docs/user-guide/overview.md) for an introduction to Kubernetes and its core concepts.
+
+See the [design overview](docs/design/) for an overview of the system design.
+
+See the [API overview](docs/api.md) and [conventions](docs/devel/api-conventions.md) for an overview of the API design.
+
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/DESIGN.md?pixel)]()