Electric grill (#20661)

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Temperature/SharedEntityHeater.cs

@@ -0,0 +1,21 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Temperature;
+
+[Serializable, NetSerializable]
+public enum EntityHeaterVisuals
+{
+    Setting
+}
+
+/// <summary>
+/// What heat the heater is set to, if on at all.
+/// </summary>
+[Serializable, NetSerializable]
+public enum EntityHeaterSetting
+{
+    Off,
+    Low,
+    Medium,
+    High
+}