added basic level selection menu

Menu/Buttons/LevelSelectButton.gd

@@ -0,0 +1,14 @@
+extends Button
+
+export var scene = "res://Menu/MainMenu.tscn"
+
+func _on_LevelSelectButton_pressed():
+	disabled = true
+	
+	GameStats.reset_board()
+	
+	var main = get_tree().current_scene
+	var Fadeout = load("res://Effects/FadeOut.tscn")
+	var fadeout = Fadeout.instance()
+	fadeout.scene_to_load = scene
+	main.add_child(fadeout)

Menu/Buttons/LevelSelectIconButton.gd

@@ -0,0 +1,11 @@
+extends TextureButton
+
+export var scene = "res://Menu/MainMenu.tscn"
+
+func _on_LevelSelectIconButton_pressed():
+	disabled = true
+	var main = get_tree().current_scene
+	var Fadeout = load("res://Effects/FadeOut.tscn")
+	var fadeout = Fadeout.instance()
+	fadeout.scene_to_load = scene
+	main.add_child(fadeout)

Menu/Buttons/LevelSelectIconButton.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Menu/Buttons/LevelSelectIconButton.gd" type="Script" id=1]
+
+[node name="LevelSelectIconButton" type="TextureButton"]
+margin_right = 40.0
+margin_bottom = 40.0
+script = ExtResource( 1 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[connection signal="pressed" from="." to="." method="_on_LevelSelectIconButton_pressed"]

Menu/Buttons/SceneSelectButton.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://Menu/Theme.tres" type="Theme" id=1]
+[ext_resource path="res://Menu/Buttons/LevelSelectButton.gd" type="Script" id=2]
+
+[node name="LevelSelectButton" type="Button"]
+margin_right = 34.0
+margin_bottom = 23.0
+theme = ExtResource( 1 )
+text = "01"
+flat = true
+script = ExtResource( 2 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[connection signal="pressed" from="." to="." method="_on_LevelSelectButton_pressed"]