Added random class

Added random class, new string
extension methods and updated the XAML documentation.

Stone_Red-C-Sharp-Utilities-Test/Program.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Stone_Red_Utilities.RandomExtentions;
+
+namespace Stone_Red_C_Sharp_Utilities_Test
+{
+    internal class Program
+    {
+        private enum MyEnum
+        {
+            a,
+            b,
+            c
+        }
+
+        private static void Main()
+        {
+            Random rnd = new Random();
+            MyEnum randomItem = rnd.NextEnum(new MyEnum());
+            Console.WriteLine(randomItem);
+        }
+    }
+}