Create PushFuture.md

Author: SoftStoneDevelop

Documentation/Stack/PushFuture.md

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+# PushFuture() Method
+
+## Definition
+Advances the pointer to the next element as if the element had been added.
+
+```C#
+public void PushFuture()
+```
+
+## Exceptions
+
+```C#
+Exception
+```
+If there is no place for the element in the collection