Switch to Maven file structure

src/main/java/tools/exceptions/NotEnabledException.java

@@ -0,0 +1,12 @@
+package tools.exceptions;
+
+public class NotEnabledException extends RuntimeException {
+
+    public NotEnabledException() {
+        super("Feature not enabled, please enable the feature in ServerConstant");
+    }
+
+    public NotEnabledException(String message) {
+        super(message);
+    }
+}