README: Add initial contents

Signed-off-by: Christopher Crone <christopher.crone@docker.com>

README.md

@@ -1,3 +1,17 @@
-# node-sdk
+# Docker CLI JavaScript SDK
+![CI](https://github.com/docker/node-sdk/workflows/CI/badge.svg)
 
-Docker cli gRPC client in javascript
+<!-- FIXME(chris-crone): Add link to NPM package -->
+This repository contains the source code for the Docker CLI JavaScript SDK. You
+can find the NPM module [here](https://xxx).
+
+> :warning: This SDK is in beta, expect things to change or break!
+
+## Getting started
+
+<!-- FIXME(chris-crone): Add usage instructions -->
+
+## Examples
+
+You can find examples for how to use this SDK in the [examples](./examples)
+directory.