changed the file structure

Code/Steiner/playGround/src/App.java

@@ -0,0 +1,12 @@
+public class App {
+    public static void main(String[] args) throws Exception {
+        System.out.println("Hello, World!");
+
+        int counter = 0;
+        for (int i = 0; i > 9; i++) {
+            counter++;
+        }
+        int resultat = counter;
+        System.out.println(resultat);
+    }
+}