Added basic formatting feature

Backend/tools-services/src/main/java/com/r11/tools/SparkApplication.java

@@ -44,6 +44,7 @@ public class SparkApplication {
         registry.registerController(new XmlController(gson, logger, saxon, xalan));
         registry.registerController(new MultipleXMLController(gson,logger, saxon));
         registry.registerController(new JsonController(gson, jsongson, logger));
+        registry.registerController(new XmlFormatterController(gson));
 
         registry.register();