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/SimplRoomPropertiesConfig.cs

@@ -0,0 +1,25 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace PDT.Plugins.Essentials.Rooms.Config
+{
+	public class SimplRoomPropertiesConfig : EssentialsHuddleVtc1PropertiesConfig
+	{
+		[JsonProperty("roomPhoneNumber")]
+		public string RoomPhoneNumber { get; set; }
+		[JsonProperty("roomURI")]
+		public string RoomURI { get; set; }
+		[JsonProperty("speedDials")]
+		public List<SimplSpeedDial> SpeedDials { get; set; }
+		[JsonProperty("volumeSliderNames")]
+		public List<string> VolumeSliderNames { get; set; }
+	}
+
+	public class SimplSpeedDial
+	{
+		[JsonProperty("name")]
+		public string Name { get; set; }
+		[JsonProperty("number")]
+		public string Number { get; set; }
+	}
+}