implement pop and push for treiber stack

Assignment_3/lib/TreiberStack.h

@@ -0,0 +1,14 @@
+#include <atomic>
+
+#include "Stack.h"
+#include "Node.h"
+
+class TreiberStack:public Stack{
+    private:
+        std::atomic<Node *> top;
+    public:
+        TreiberStack(ADTOperationQueue * queue);
+        void push(int element);
+        int pop();
+        int size();
+};