Initial data commit

Task/Queue-Usage/PureBasic/queue-usage.basic

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+NewList MyStack()
+
+Procedure Push(n)
+  Shared MyStack()
+  LastElement(MyStack())
+  AddElement(MyStack())
+  MyStack()=n
+EndProcedure
+
+Procedure Pop()
+  Shared MyStack()
+  Protected n
+  If FirstElement(MyStack())  ; e.g. Stack not empty
+    n=MyStack()
+    DeleteElement(MyStack(),1)
+  EndIf
+  ProcedureReturn n
+EndProcedure
+
+Procedure Empty()
+  Shared MyStack()
+  If  ListSize(MyStack())=0
+    ProcedureReturn #True
+  EndIf
+  ProcedureReturn #False
+EndProcedure
+
+;----   Example of implementation ----
+Push(3)
+Push(1)
+Push(4)
+Push(1)
+Push(5)
+While Not Empty()
+  Debug Pop()
+Wend