Add Sample

* add hello gui

.gitignore

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 # IntelliJ
 .idea/
 *.iml
+javafx_scenebuilder_kit_javadoc-2_0.zip
+out/

src/sample/Controller.java

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+package sample;
+
+public class Controller {
+}

src/sample/Main.java

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+package sample;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+public class Main extends Application {
+
+    @Override
+    public void start(Stage primaryStage) throws Exception{
+        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
+        primaryStage.setTitle("Hello World");
+        primaryStage.setScene(new Scene(root, 300, 275));
+        primaryStage.show();
+    }
+
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}

src/sample/sample.fxml

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+<?import javafx.geometry.Insets?>
+<?import javafx.scene.layout.GridPane?>
+
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<GridPane fx:controller="sample.Controller"
+          xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10">
+</GridPane>