docs: add missing XML comments for Mobile Control Project

src/PepperDash.Essentials.MobileControl/Touchpanel/ITheme.cs

@@ -7,8 +7,15 @@ namespace PepperDash.Essentials.Touchpanel
     /// </summary>
     public interface ITheme : IKeyed
     {
+        /// <summary>
+        /// Current theme
+        /// </summary>
         string Theme { get; }
 
+        /// <summary>
+        /// Set the theme with the given value
+        /// </summary>
+        /// <param name="theme">The theme to set</param>
         void UpdateTheme(string theme);
     }
 }