Update GetEnumerator.md

Author: SoftStoneDevelop

Documentation/Stack/GetEnumerator.md

@@ -1 +1,13 @@
+# IEnumerator GetEnumerator() Method
 
+## Definition
+Returns an enumerator that iterates through the collection.
+
+```C#
+System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+```
+
+## Returns
+`System.Collections.IEnumerator`
+
+An `IEnumerator` that can be used to iterate through the collection.