Add initial game code

scripts/Order.cs

@@ -0,0 +1,21 @@
+public abstract class Order
+{
+    public enum OrderCategory
+    {
+        TICK,
+        DESTINATION,
+    }
+    public enum OrderType
+    {
+        IDLE,
+        MOVE_THRUSTERS, MOVE_WARP,
+        ENTER_GALAXY, EXIT_GALAXY,
+        ENTER_NEBULA, EXIT_NEBULA,
+        ENTER_SYSTEM, EXIT_SYSTEM,
+        ORBIT, LEAVE_ORBIT,
+        LAND, TAKE_OFF,
+    }
+
+    public OrderCategory Category { get; protected set; }
+    public OrderType Type { get; protected set; }
+}