chore: add room configs back in

At the moment, MC relies on some of these classes, so they are necessary
in Essentials for now. We can explore how to remove them at a later date

src/PepperDash.Essentials.Core/Room/Config/EssentialsNDisplayRoomPropertiesConfig.cs

@@ -0,0 +1,34 @@
+
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using PepperDash.Core;
+using PepperDash.Essentials.Core;
+
+namespace PDT.Plugins.Essentials.Rooms.Config
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public class EssentialsNDisplayRoomPropertiesConfig : EssentialsConferenceRoomPropertiesConfig
+    {
+        [JsonProperty("defaultAudioBehavior")]
+        public string DefaultAudioBehavior { get; set; }
+        [JsonProperty("defaultVideoBehavior")]
+        public string DefaultVideoBehavior { get; set; }
+        [JsonProperty("displays")]
+        public Dictionary<eSourceListItemDestinationTypes, DisplayItem> Displays { get; set; }
+
+        public EssentialsNDisplayRoomPropertiesConfig()
+        {
+            Displays = new Dictionary<eSourceListItemDestinationTypes, DisplayItem>();
+        }
+
+    }
+
+    public class DisplayItem : IKeyName
+    {
+        public string Key { get; set; }
+        public string Name { get; set; }
+    }
+
+}