feat(file-chooser): add file chooser plugin support (#495)

src/plugins/file-chooser.ts

@@ -0,0 +1,30 @@
+import {Plugin, Cordova} from './plugin';
+/**
+ * @name FileChooser
+ * @description
+ *
+ * Opens the file picker on Android for the user to select a file, returns a file URI.
+ *
+ * @usage
+ * ```
+ * import {FileChooser} from 'ionic-native';
+ *
+ * FileChooser.open()
+ *   .then(uri => console.log(uri);
+ *   .catch(e => console.log(e);
+ *
+ * ```
+ */
+@Plugin({
+  plugin: 'http://github.com/don/cordova-filechooser.git',
+  pluginRef: 'fileChooser',
+  repo: 'https://github.com/don/cordova-filechooser',
+  platforms: ['Android']
+})
+export class FileChooser {
+  /**
+   * Open a file
+   */
+  @Cordova()
+  static open(): Promise<string> {return; }
+}