Create TopFuture.md

Author: SoftStoneDevelop

Documentation/Stack/TopFuture.md

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+# TopFuture() Method
+
+## Definition
+Return pointer to future the element from the top of the stack.
+
+```C#
+public void* TopFuture()
+```
+
+## Return
+`void*`
+
+Pointer to future the element from the top of the stack. For collections on primitive types return type is `{ItemType}*` instead of `void*`.
+
+## Exceptions
+
+```C#
+Exception
+```
+
+If Future element not available