Clarify how to use image_picker (flutter#73)

* Update README.md

* Update CHANGELOG.md

* Update pubspec.yaml

packages/image_picker/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.2+2
+
+* Updated README
+
 ## 0.0.2+1
 
 * Updated README

packages/image_picker/README.md

@@ -4,7 +4,54 @@
 
 A Flutter wrapper for the native image picker.
 
+This enables picking images from the image library, or to take new pictures with the camera.
+
 *Note*: This plugin is still under development, and some APIs might not be available yet. [Feedback welcome](https://github.com/flutter/flutter/issues) and [Pull Requests](https://github.com/flutter/plugins/pulls) are most welcome!
 
 ## Usage
 To use this plugin, add `image_picker` as a [dependency in your pubspec.yaml file](https://flutter.io/platform-plugins/).
+
+Next, to make the app build for android, open the file `android/build.gradle`, and add the `jitpack.io` line shown below:
+
+```
+allprojects {
+   repositories {
+       jcenter()
+       maven { url "https://jitpack.io" }    // Enable getting dependencies from jitpack.io.
+   }
+}
+```
+
+### Example
+
+``` dart
+class _MyHomePageState extends State<MyHomePage> {
+  File imageFile;
+
+  getImage() async {
+    var _fileName = await ImagePicker.pickImage();
+    setState(() {
+      imageFile = _fileName;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text('Image Picker Example'),
+      ),
+      body: new Center(
+        child: imageFile == null
+            ? new Text('No image selected.')
+            : new Image.file(imageFile),
+      ),
+      floatingActionButton: new FloatingActionButton(
+        onPressed: getImage,
+        tooltip: 'Pick Image',
+        child: new Icon(Icons.add_a_photo),
+      ),
+    );
+  }
+}
+```

packages/image_picker/pubspec.yaml

@@ -3,7 +3,7 @@ name: image_picker
 description: Flutter plugin that shows an image picker.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/image_picker
-version: 0.0.2+1
+version: 0.0.2+2
 
 flutter:
   plugin: