update title window

app/src/main/java/gui/Main.java

@@ -7,7 +7,7 @@ import imgui.app.Configuration;
 public class Main extends Application {
     @Override
     protected void configure(Configuration config) {
-        config.setTitle("Dear ImGui is Awesome!");
+        config.setTitle("Let's play sudoku!");
     }
 
     @Override

app/src/main/java/sudoku/ImmutableCell.java

@@ -6,4 +6,5 @@ public class ImmutableCell extends Cell {
 		super(symbolIndex);
 	}
 
+
 }