adding stack implementation

lectures/14_stacks_queues/stack_test.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+#include "stack.h"
+
+int main() {
+	Stack<int> myStack;
+
+	myStack.push(10);
+	myStack.push(20);
+	myStack.push(30);
+	myStack.push(40);
+	myStack.push(50);
+
+	std::cout << "Size of stack: " << myStack.size() << std::endl;
+	std::cout << "Top element: " << myStack.top() << std::endl;
+
+	if (!myStack.empty()) {
+		std::cout << "Stack is not empty" << std::endl;
+	} else {
+		std::cout << "Stack is empty" << std::endl;
+	}
+
+	myStack.pop();
+	std::cout << "Top element after pop: " << myStack.top() << std::endl;
+
+	return 0;
+}