Resolve WES-143 "Feedback courses"

Assets/Common/Interfaces/Learnable.cs

@@ -18,6 +18,16 @@ public class Learnable
     /// </summary>
     public Sprite image;
 
+    /// <summary>
+    /// Sprite of the hand gesture used for fingerspelling
+    /// </summary>
+    public Sprite handGuide = null;
+
+    /// <summary>
+    /// Addaptive threshold
+    /// </summary>
+    public float thresholdPrecentage = 0.90f;
+
     /// <summary>
     /// Example video clip
     /// </summary>