feat: send online status

close #69

src/Client.js

@@ -514,6 +514,15 @@ class Client extends EventEmitter {
         });
     }
 
+    /**
+     * Marks the client as online
+     */
+    async sendPresenceAvailable() {
+        return await this.pupPage.evaluate(() => {
+            return window.Store.Wap.sendPresenceAvailable();
+        });
+    }
+
     /**
      * Enables and returns the archive state of the Chat
      * @returns {boolean}