Added main menu and basic functionality

Scripts/MainMenu.cs

@@ -0,0 +1,25 @@
+using Godot;
+using System;
+
+public partial class MainMenu : Control
+{
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+	}
+
+	// Called every frame. 'delta' is the elapsed time since the previous frame.
+	public override void _Process(double delta)
+	{
+	}
+
+	public void OnPlayPressed()
+	{
+		GetTree().ChangeSceneToFile("res://Scenes/Game.tscn");
+	}
+
+	public void OnQuitPressed()
+	{
+		GetTree().Quit();
+	}
+}