Add AVLoadingIndicatorView

app/src/main/res/layout/fragment_authentication_server.xml

@@ -29,6 +29,15 @@
         android:inputType="textUri"
         android:paddingStart="0dp" />
 
+    <com.wang.avi.AVLoadingIndicatorView
+        android:id="@+id/view_loading"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:visibility="gone"
+        app:indicatorName="BallPulseIndicator"
+        tools:visibility="visible" />
+
     <Button
         android:id="@+id/button_connect"
         style="@style/AuthenticationButton"