fix(angular): add NavParams

angular/src/directives/navigation/nav-params.ts

@@ -0,0 +1,45 @@
+/**
+ * @name NavParams
+ * @description
+ * NavParams are an object that exists on a page and can contain data for that particular view.
+ * Similar to how data was pass to a view in V1 with `$stateParams`, NavParams offer a much more flexible
+ * option with a simple `get` method.
+ *
+ * @usage
+ * ```ts
+ * import { NavParams } from '@ionic/angular';
+ *
+ * export class MyClass{
+ *
+ *  constructor(navParams: NavParams){
+ *    // userParams is an object we have in our nav-parameters
+ *    navParams.get('userParams');
+ *  }
+ *
+ * }
+ * ```
+ */
+export class NavParams {
+
+  constructor(public data: {[key: string]: any} = {}) {}
+
+  /**
+   * Get the value of a nav-parameter for the current view
+   *
+   * ```ts
+   * import { NavParams } from 'ionic-angular';
+   *
+   * export class MyClass{
+   *  constructor(public navParams: NavParams){
+   *    // userParams is an object we have in our nav-parameters
+   *    this.navParams.get('userParams');
+   *  }
+   * }
+   * ```
+   *
+   * @param {string} param Which param you want to look up
+   */
+  get(param: string): any {
+    return this.data[param];
+  }
+}