Feat/loading animation

Loading animation for upload,signin and login scenes #35 (closed)

src/main/App/Css/Css.java

@@ -277,6 +277,10 @@ public class Css {
         }
     }
 
+    /**
+     * setLoadingAnimation styles all ProgressIndicator put as parameter
+     * @param args
+     */
     public static void setLoadingAnimation(ProgressIndicator... args){
         for(ProgressIndicator progressIndicator : args){
             progressIndicator.setStyle("-fx-progress-color: dimgrey; -fx-cursor: wait");