made Lorem partial class - updated readme

readme.md

@@ -53,5 +53,22 @@ string number = LoremNET.Lorem.Random(numbers);
 Lorem.NET includes a thread-safe System.Random instance.
 
 ```csharp
-int i = LoremNET.RandomHelper.Instance.Next(1, 2)
+int i = LoremNET.RandomHelper.Instance.Next(1, 2);
+```
+
+### Extending the Class
+
+If you want to extend the class to add more methods, go right ahead!
+
+```csharp
+namespace LoremNET
+{
+    public partial class Lorem
+    {
+        public static string Email(string domain)
+        {
+            return Email().Replace(".com", string.Format(".{0}", domain));
+        }
+    }
+}
 ```