Add a readme

package/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ol",
-  "version": "3.20.0-beta.1",
+  "version": "3.21.0-beta.1",
   "description": "OpenLayers",
   "main": "index.js",
   "license": "BSD-2-Clause",

package/readme.md

@@ -0,0 +1,33 @@
+# `ol`
+
+[OpenLayers](https://openlayers.org/) for CommonJS module loaders.
+
+**Note: This is still a work in progress.  Not yet ready for production.**
+
+## Usage
+
+Add the `ol` package as a dependency to your project.
+
+    npm install ol@beta --save
+
+Require just what you need for your application:
+
+```js
+var OLMap = require('ol/Map');
+var View = require('ol/View');
+var TileLayer = require('ol/layer/Tile');
+var OSM = require('ol/source/OSM');
+
+var map = new OLMap({
+  target: 'map',
+  layers: [
+    new TileLayer({
+      source: new OSM()
+    })
+  ],
+  view: new View({
+    center: [0, 0],
+    zoom: 2
+  })
+});
+```