Added unit command

Assets/Scripts/Command/CommandInvoker.cs

@@ -0,0 +1,16 @@
+public class CommandInvoker {
+    private Stack<ICommand> commandHistory = new Stack<ICommand>();
+
+    public void ProcessCommand(ICommand command) {
+        ExecuteCommand(command);
+        RegisterCommand(command);
+    }
+
+    private void ExecuteCommand(ICommand command) {
+        command.Execute();
+    }
+
+    private void RegisterCommand(ICommand command) {
+        commandHistory.Push(command);
+    }
+}

Assets/Scripts/Command/ICommand.cs

@@ -0,0 +1,4 @@
+interface ICommand
+{
+    void Execute();
+}

Assets/Scripts/Command/IUnitCommand.cs

@@ -0,0 +1,13 @@
+public class IUnitCommand : ICommand
+{
+    public int ActorUnitId { get; set; }
+    public int TargetUnitId { get; set; }
+    public int ActorPlayerId { get; set; }
+    public int TargetPlayerId { get; set; }
+
+    protected UnitController actor;
+    protected UnitController target;
+
+    public abstract void Execute();
+    public abstract bool WillHitTarget();
+}