added a function to create the window for the UI.

game/window.go

@@ -1 +1,41 @@
 package game
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/widget"
+)
+
+var TextLabel *widget.Label
+
+// creates a window for the TicTacToe game application.
+func CreateWindow() fyne.Window {
+	// Create the app.
+	myApp := app.New()
+
+	// Create a new window for the game application.
+	myWindow := myApp.NewWindow("TicTacToe")
+
+	// Set the text of our TextLabel to TicTacToe
+	TextLabel = widget.NewLabel("TicTacToe")
+
+	// Create a new button with the text "Restart" and a handler function, if it gets pressed.
+	restartButton := widget.NewButton("Restart", func() {
+		// Add logic here to restart the game.
+	})
+
+	// vertical box layout containg the top Items, here the textlabel and the button.
+	topItems := container.NewVBox(TextLabel, restartButton)
+
+	// Generate content for the window using a border layout with the topItems as the only child.
+	content := container.New(layout.NewBorderLayout(topItems, nil, nil, nil), topItems)
+
+	// Set the content and size of the window.
+	myWindow.SetContent(content)
+	myWindow.Resize(fyne.NewSize(300, 300))
+
+	// Return the created window.
+	return myWindow
+}