feat(plugin): add Uptime plugin

feat(plugin): add Uptime plugin

src/@ionic-native/plugins/uptime/index.ts

@@ -0,0 +1,42 @@
+import { Injectable } from '@angular/core';
+import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
+
+/**
+ * @name Uptime
+ * @description
+ * This plugin return the device uptime, without sleep time.
+ *
+ * @usage
+ * ```typescript
+ * import { Uptime } from '@ionic-native/uptime';
+ *
+ * constructor(private uptime: Uptime) { }
+ *
+ * ...
+ *
+ * this.uptime.getUptime()
+ *   .then((uptime: any) => console.log(uptime))
+ *   .catch((error: any) => console.log(error));
+ *
+ * ```
+ */
+@Plugin({
+  pluginName: 'Uptime',
+  plugin: 'cordova-plugin-uptime',
+  pluginRef: 'Uptime',
+  repo: 'https://github.com/s1lviu/cordova-plugin-uptime',
+  install: '',
+  installVariables: [],
+  platforms: ['Android']
+})
+@Injectable()
+export class Uptime extends IonicNativePlugin {
+  /**
+   * This function return system uptime
+   * @return {Promise<string>} Returns a promise that return the uptime in milliseconds
+   */
+  @Cordova()
+  getUptime(): Promise<string> {
+    return;
+  }
+}