create max_heap.md

priority_queue/max_heap.md

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+// program that checks if priority_queue is a Max Heap
+
+   std::priority_queue<int> my;
+    //load priority_queue with elements 
+    my.push(2);
+    my.push(10);
+    my.push(4);
+    my.push(6);
+    my.push(8);
+
+    // iterates entire queue and one by one extracts items from max heap
+    while (!my.empty()) 
+    {
+      std::cout << my.top() << " ";
+        my.pop();
+     }
+
+    return 0;
+
+  //exspected output should be "10 8 6 4 2"