Initial Code Commit

A working version of the calculator. Very simple.

src/VariableItem.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace AdvancedCalculator
+{
+    public class VariableItem
+    {
+        #region Properties
+
+        public string VariableName { get; set; }
+
+        public string Value { get; set; }
+
+        public Visibility ExpressionVisibility { get; set; }
+
+        public string ExpressionComputation { get; set; }
+
+        #endregion
+    }
+}