Resolve WES-99 "Cc refactor"

Assets/Common/Scripts/MainMenuScreen.cs

@@ -0,0 +1,57 @@
+using System.IO;
+using UnityEngine;
+
+/// <summary>
+/// StartScreen scene manager 
+/// </summary>
+public class MainMenuScreen : MonoBehaviour
+{
+    /// <summary>
+    /// Referece to the userlist to check whether an user account is present
+    /// </summary>
+    public UserList userList;
+
+    /// <summary>
+    /// Check on load whether a user is already present, 
+    /// if not load the UserCreationScreen scene so the user can create a new account
+    /// </summary>
+    void Awake()
+    {
+        if (!File.Exists(UserList.PATH) || userList.GetUsers().Count <= 0)
+        {
+            SystemController.GetInstance().LoadNextScene("Accounts/Scenes/UserCreationScreen");
+        }
+    }
+
+    /// <summary>
+    /// Quit the application
+    /// </summary>
+    public void QuitApplication()
+    {
+        Application.Quit();
+    }
+
+    /// <summary>
+    /// Load the `CoursesMenuScreen` scene
+    /// </summary>
+    public void GotoCourses()
+    {
+        SystemController.GetInstance().LoadNextScene("Common/Scenes/CoursesMenuScreen");
+    }
+
+    /// <summary>
+    /// Load the `ListMinigamesScreen` scene
+    /// </summary>
+    public void GotoMinigames()
+    {
+        SystemController.GetInstance().LoadNextScene("Common/Scenes/ListMinigamesScreen");
+    }
+
+    /// <summary>
+    /// Load the `SettingsScreen` scene
+    /// </summary>
+    public void GotoSettings()
+    {
+        SystemController.GetInstance().LoadNextScene("Common/Scenes/SettingsScreen");
+    }
+}