Typing indicator (typing chat bubble) (#8215)

Content.Shared/Chat/TypingIndicator/TypingIndicatorVisuals.cs

@@ -0,0 +1,15 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Chat.TypingIndicator;
+
+[Serializable, NetSerializable]
+public enum TypingIndicatorVisuals : byte
+{
+    IsTyping
+}
+
+[Serializable]
+public enum TypingIndicatorLayers : byte
+{
+    Base
+}