feat(DocumentPicker) adds DocumentPicker ios plugin

feat(DocumentPicker) adds DocumentPicker ios plugin

src/@ionic-native/plugins/document-picker/index.ts

@@ -0,0 +1,45 @@
+
+import { Injectable } from '@angular/core';
+import { Cordova, Plugin, IonicNativePlugin } from '@ionic-native/core';
+
+
+/**
+ * @name iOS DocumentPicker
+ * @description
+ *
+ * Opens the file picker on iOS for the user to select a file, returns a file URI.
+ * Allows the user to upload files from icloud
+ *
+ * @usage
+ * ```typescript
+ * import { IOSDocumentPicker } from '@ionic-native/document-picker';
+ *
+ * constructor(private docPicker: IOSDocumentPicker) { }
+ *
+ * ...
+ *
+ * this.docPicker.getFile('all')
+ *   .then(uri => console.log(uri))
+ *   .catch(e => console.log(e));
+ *
+ * ```
+ */
+@Plugin({
+  pluginName: 'IOSDocumentPicker',
+  plugin: 'cordova-plugin-documentpicker.DocumentPicker',
+  pluginRef: 'DocumentPicker',
+  repo: 'https://github.com/iampossible/Cordova-DocPicker',
+  platforms: ['iOS']
+})
+@Injectable()
+export class DocumentPicker extends IonicNativePlugin {
+
+  /**
+   * Open a file
+   * @param {string} filters files between 'image', 'pdf' or 'all'
+   * @returns {Promise<string>}
+   */
+  @Cordova()
+  getFile(options?: string): Promise<string> { return; }
+
+}