Add a new docs directory. refs #109

Add a new 'docs' directory for that can be built on in the future. Docs are
divided into a 'user guide', 'contributor guide', and 'architecture guide'.
This is currently a work in progress.

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Change-Id: I78d08d6a89d686e92d3415d4269463e8e74bddee

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+# gVisor Documentation
+
+**This doc is a work in progress. For the definitive documentation please see
+the [README](../README.md)**
+
+gVisor is a user-space kernel, written in Go, that implements a substantial
+portion of the [Linux system call interface][linux-interface]. It provides an
+additional layer of isolation between running applications and the host
+operating system.
+
+gVisor includes an [Open Container Initiative (OCI)][oci] runtime called `runsc`
+that makes it easy to work with existing container tooling. The `runsc` runtime
+integrates with Docker and Kubernetes, making it simple to run sandboxed
+containers.
+
+Check out the [gVisor Quick Start](user_guide/quick_start.md) to get started
+using gVisor.
+
+gVisor takes a distinct approach to container sandboxing and makes a different
+set of technical trade-offs compared to existing sandbox technologies, thus
+providing new tools and ideas for the container security landscape.
+
+Check out [Why gVisor?](architecture_guide/why.md) for more on why we made
+gVisor.
+
+## How this documentation is organized
+
+-   The [Architecture Guide](architecture_guide/README.md) explains about
+    gVisor's architecture & design philosophy. Start here if you would like to
+    know more about how gVisor works and why it was created.
+-   The [User Guide](user_guide/README.md) contains info on how to use gVisor
+    and integrate it into your application or platform.
+-   The [Contributer Guide](contributer_guide/README.md) includes documentation
+    on how to build gVisor, run tests, and contribute to gVisor's development.
+
+[linux-interface]: https://en.wikipedia.org/wiki/Linux_kernel_interfaces
+[oci]: https://www.opencontainers.org