Add example for heap sort

cpp/algorithms/sorting/heap/lib-heap.hpp

@@ -0,0 +1,27 @@
+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2021 Shaun Reed, all rights reserved               ##
+## About: An example implementation of heap sort using a custom library      ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+###############################################################################
+*/
+
+#ifndef LIB_HEAP_HPP
+#define LIB_HEAP_HPP
+
+#include <vector>
+
+#define ARRAY_LENGTH 10
+
+size_t Parent(const size_t &index);
+size_t Left(const size_t &index);
+size_t Right(const size_t &index);
+
+void MaxHeapify(std::vector<int> &array, size_t thisIndex, int &heapSize);
+
+void BuildMaxHeap(std::vector<int> &array, int &heapSize);
+
+void HeapSort(std::vector<int> &array);
+
+#endif // LIB_HEAP_HPP