Markings (#7072)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/IoC/SharedContentIoC.cs

@@ -1,4 +1,5 @@
 using Content.Shared.CharacterAppearance;
+using Content.Shared.Markings;
 using Robust.Shared.IoC;
 
 namespace Content.Shared.IoC
@@ -8,6 +9,7 @@ namespace Content.Shared.IoC
         public static void Register()
         {
             IoCManager.Register<SpriteAccessoryManager, SpriteAccessoryManager>();
+            IoCManager.Register<MarkingManager, MarkingManager>();
         }
     }
 }