Implement simple user creation system

Assets/Common/Scripts/User.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(menuName = "Create new Scriptable/User/User")]
+public class User : ScriptableObject
+{
+    [Header("Personal data")]
+    // User nickname
+    public string username;
+    // User avatar
+    public Sprite avatar;
+
+    [Header("Personal settings")]
+    // TODO: set personal settings and preferences
+
+    [Header("Progress")]
+    // Total playtime
+    public double playtime;
+    [SerializeField]
+    // List of courses a user started/completed
+    public List<Progress> courses = new List<Progress>();
+    [SerializeField]
+    // List of minigames a user played
+    public List<Progress> minigames = new List<Progress>();
+}