Reorganize commands into the Commands folder (#2679)

* Reorganize commands into the Commands folder

* RIDER

Content.Server/Commands/Mobs/AddOverlayCommand.cs

@@ -0,0 +1,33 @@
+using Content.Server.Administration;
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Shared.Administration;
+using Robust.Server.Interfaces.Console;
+using Robust.Server.Interfaces.Player;
+
+namespace Content.Server.Commands.Mobs
+{
+    [AdminCommand(AdminFlags.Debug)]
+    public class AddOverlayCommand : IClientCommand
+    {
+        public string Command => "addoverlay";
+        public string Description => "Adds an overlay by its ID";
+        public string Help => "addoverlay <id>";
+
+        public void Execute(IConsoleShell shell, IPlayerSession player, string[] args)
+        {
+            if (args.Length != 1)
+            {
+                shell.SendText(player, "Expected 1 argument.");
+                return;
+            }
+
+            if (player?.AttachedEntity != null)
+            {
+                if (player.AttachedEntity.TryGetComponent(out ServerOverlayEffectsComponent overlayEffectsComponent))
+                {
+                    overlayEffectsComponent.AddOverlay(args[0]);
+                }
+            }
+        }
+    }
+}