fix: write readme on how to use

fixes #9

Author: shanejonas

README.md

@@ -0,0 +1,42 @@
+# docs-react
+OpenRPC documentation as a react component
+
+#### What is this?
+This is a react component that will render documentation for a given OpenRPC document.
+
+**Screenshot**:
+
+![image](https://user-images.githubusercontent.com/364566/54795109-1b1f5b80-4c08-11e9-9ba9-cc2f2d96c692.png)
+
+
+#### How do I use this?
+
+##### Installation:
+```
+npm install --save @open-rpc/docs-react
+```
+##### Usage:
+```
+import Documentation from "@open-rpc/docs-react";
+```
+and then use it somewhere:
+
+```
+<Documentation schema={schema} />
+```
+
+##### In a new project:
+Here's how it would be used in a new `npm init react-app --typescript <appname>`  project:
+```
+import React from "react";
+import ReactDOM from "react-dom";
+import Documentation from "@open-rpc/docs-react";
+
+const schema = {
+  "info": {
+    "title": "My New API"
+  }
+};
+
+ReactDOM.render(<Documentation schema={schema} />, document.getElementById("root"));
+```