finished portal fundimentals

Assets/Scripts/Command.cs

@@ -0,0 +1,24 @@
+//Command.cs
+using UnityEngine;
+
+public abstract class Command
+{
+    public abstract KeyCode Key { get; set; }
+    public abstract string Description { get; }
+
+    /*
+    Todo:
+        1. Add an abstract Execute method with an argument for receiver.
+            For your consideration:
+                What would make for a good Execute receiver parameter?
+                Should we try to limit the receiver types?
+                How precisely can we limit the receiver's type?
+                Could we move the receiver into command data instead?
+                What are the benefits of either approach? Which works best here?
+    */
+
+    /*
+    2. Create a MoveCommand class, which executes Walk method in TileBasedMovement component.
+       Execute method of this command should call the Walk(Vector3 direction) method of GridMovement.
+*/
+}