Re-organize all projects (#4166)

Content.Client/Notifications/Managers/IClientNotifyManager.cs

@@ -0,0 +1,14 @@
+using Content.Shared.Notification;
+using Robust.Shared.Map;
+using Robust.Shared.Timing;
+
+namespace Content.Client.Notifications.Managers
+{
+    public interface IClientNotifyManager : ISharedNotifyManager
+    {
+        void Initialize();
+        void PopupMessage(ScreenCoordinates coordinates, string message);
+        void PopupMessage(string message);
+        void FrameUpdate(FrameEventArgs eventArgs);
+    }
+}