Added main menu

menu/main_menu.gd

@@ -0,0 +1,22 @@
+extends Node
+
+signal continue_game
+signal new_game
+signal quit_game
+signal show_options
+
+
+func _on_continue_button_pressed() -> void:
+    continue_game.emit()
+
+
+func _on_start_button_pressed() -> void:
+    new_game.emit()
+
+
+func _on_options_button_pressed() -> void:
+    show_options.emit()
+
+
+func _on_quit_button_pressed() -> void:
+    quit_game.emit()