Add simple native formatting test

Author: EvaristeGalois11

util/HelloWorld.java

@@ -0,0 +1,8 @@
+class HelloWorld {
+    public static void main(String[] args) {
+        System
+                .out
+                .println
+                        ("Hello, World!");
+    }
+}

util/test-native.sh

@@ -28,3 +28,5 @@ if [[ $status -ne 2 ]]; then
   echo "google-java-format_linux (native) without arguments should have printed usage help and exited with 2, but did not :("
   exit 1
 fi
+
+core/target/google-java-format util/HelloWorld.java