Move some files out of Content.Shared root because I forgot (#4182)

Content.Shared/IoC/SharedContentIoC.cs

@@ -0,0 +1,13 @@
+using Content.Shared.CharacterAppearance;
+using Robust.Shared.IoC;
+
+namespace Content.Shared.IoC
+{
+    public static class SharedContentIoC
+    {
+        public static void Register()
+        {
+            IoCManager.Register<SpriteAccessoryManager, SpriteAccessoryManager>();
+        }
+    }
+}