Added support for void type

Author: Sergio0694

Microsoft.Toolkit/Extensions/TypeExtensions.cs

@@ -39,7 +39,8 @@ public static class TypeExtensions
             [typeof(double)] = "double",
             [typeof(decimal)] = "decimal",
             [typeof(object)] = "object",
-            [typeof(string)] = "string"
+            [typeof(string)] = "string",
+            [typeof(void)] = "void"
         };
 
         /// <summary>

UnitTests/UnitTests.Shared/Extensions/Test_TypeExtensions.cs

@@ -21,6 +21,7 @@ public class Test_TypeExtensions
         [DataRow("decimal", typeof(decimal))]
         [DataRow("object", typeof(object))]
         [DataRow("string", typeof(string))]
+        [DataRow("void", typeof(void))]
         public void Test_TypeExtensions_BuiltInTypes(string name, Type type)
         {
             Assert.AreEqual(name, type.ToTypeString());