Implement simple user creation system

Assets/Common/Scripts/Progress.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.Serialization.Formatters.Binary;
+using UnityEngine;
+
+
+[Serializable]
+public class Progress
+{
+    [Serializable]
+    // Helper class to serialize into byte[]
+    protected class DataEntry
+    {
+        public string key;
+        public List<byte> bytes = new List<byte>();
+
+        public DataEntry(string key, byte[] data)
+        {
+            this.key = key;
+            this.bytes = new List<byte>(data);
+        }
+    }
+
+
+    // TODO: use inheritance to create seperate MinigameProgress and CourseProgress
+    [Header("Course or Minigame")]
+    // TODO: change to course/minigame ScriptableObject reference
+    // Index of item in courses/minigame list object
+    public int index;
+
+    [SerializeField]
+    // values belonging to a certain key, in List (which can be serialized)
+    private List<DataEntry> entries = new List<DataEntry>();
+
+
+    // Add new `key` := `value`, returns `true` if successful
+    public bool Add<T>(string key, T data)
+    {
+        if (data == null)
+            return false;
+
+        // Search for already existing key
+        foreach (DataEntry entry in entries)
+        {
+            if (entry.key == key)
+            {
+                return false;
+            }
+        }
+
+        // Hacky serialization stuff
+        BinaryFormatter bf = new BinaryFormatter();
+        using (MemoryStream ms = new MemoryStream())
+        {
+            bf.Serialize(ms, data);
+            entries.Add(new DataEntry(key, ms.ToArray()));
+            return true;
+        }
+    }
+
+    // Get the value of type `T` belonging to `key`
+    public T Get<T>(string key)
+    {
+        BinaryFormatter bf = new BinaryFormatter();
+        using (MemoryStream ms = new MemoryStream())
+        {
+            // Find the correct key
+            foreach (DataEntry entry in entries)
+            {
+                if (entry.key == key)
+                {
+                    // Hacky serialization stuff
+                    byte[] data = entry.bytes.ToArray();
+                    ms.Write(data, 0, data.Length);
+                    ms.Seek(0, SeekOrigin.Begin);
+                    return (T)bf.Deserialize(ms);
+                }
+            }
+        }
+        // Raise an exception when key is not found
+        throw new KeyNotFoundException();
+    }
+}