add readme (#3)

README.md

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+![conduit][logo]
+
+[![GitHub license][license-badge]](LICENSE)
+[![Slack Status][slack-badge]][slack]
+<!--
+TODO
+- travis CI
+- discourse
+-->
+
+:balloon: Welcome to Conduit! :wave:
+
+Conduit is an ultralight service mesh for Kubernetes from the makers of [Linkerd][l5d]. It
+features a native proxy, written in [Rust][rust], that boasts the performance of C without
+all the heartbleed.
+
+Conduit is **experimental**. Currently, it _only supports HTTP/2_ and is especially
+well-suited for [gRPC][grpc]. Follow our progress towards production-readiness here and on
+[twitter][twitter].
+
+<!-- TODO add roadmap link -->
+
+## Code of Conduct
+
+This project is for everyone. We ask that our users and contributors take a few
+minutes to review our [code of conduct][coc].
+
+## License
+
+Copyright 2017, Buoyant Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+these files except in compliance with the License. You may obtain a copy of the
+License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+
+<!-- refs -->
+[coc]: https://github.com/linkerd/linkerd/wiki/Linkerd-code-of-conduct
+<!-- [examples]: https://github.com/runconduit/conduit-examples -->
+[grpc]: https://grpc.io/
+[l5d]: https://linkerd.io/
+[license-badge]: https://img.shields.io/github/license/linkerd/linkerd.svg
+[logo]: https://user-images.githubusercontent.com/240738/33589722-649152de-d92f-11e7-843a-b078ac889a39.png
+<!-- [releases]: https://github.com/runconduit/conduit -->
+[rust]: https://rust-lang.org/
+[twitter]: https://twitter.com/runconduit/
+[slack-badge]: http://slack.linkerd.io/badge.svg
+[slack]: http://slack.linkerd.io