Add weight limit to scale

Elwig/Helpers/Weighing/IScale.cs

@@ -36,6 +36,11 @@ namespace Elwig.Helpers.Weighing {
         /// </summary>
         bool HasFillingClearance { get; }
 
+        /// <summary>
+        /// The maximal configured weight limit of the scale in kg
+        /// </summary>
+        int? WeightLimit { get; }
+
         /// <summary>
         /// Get the current weight on the scale without performing a weighing process
         /// </summary>