feat(nativestorage): add NativeStorage plugin wrapper

src/plugins/nativestorage.ts

@@ -0,0 +1,38 @@
+import {Plugin, Cordova} from './plugin';
+/**
+ * @name Native Storage
+ */
+@Plugin({
+  plugin: 'cordova-plugin-nativestorage',
+  pluginRef: 'NativeStorage',
+  repo: 'https://github.com/TheCocoaProject/cordova-plugin-nativestorage'
+})
+export class NativeStorage {
+  /**
+   * Stores a value
+   * @param reference
+   * @param value
+   */
+  @Cordova()
+  static setItem(reference: string, value: any): Promise<any> {return; }
+
+  /**
+   * Gets a stored item
+   * @param reference
+   */
+  @Cordova()
+  static getItem(reference: string): Promise<any> {return; }
+
+  /**
+   * Removes a single stored item
+   * @param reference
+   */
+  @Cordova()
+  static remove(reference: string): Promise<any> {return; }
+
+  /**
+   * Removes all stored values.
+   */
+  @Cordova()
+  static clear(): Promise<any> {return; }
+}