refactor: move all scripts to Scripts folder

Assets/Scripts/MainMenu.cs

@@ -0,0 +1,20 @@
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class MainMenu : MonoBehaviour
+{
+    public void LaunchGame()
+    {
+        SceneManager.LoadSceneAsync("SelectLevelScene");
+    }
+
+    public void OpenSettings()
+    {
+        // SceneManager.LoadSceneAsync(?);
+    }
+
+    public void QuitGame()
+    {
+        Application.Quit();
+    }
+}