add API and data read

main.cpp

+#include "sorting.h"
+using namespace std ;
+
+int main()
+{
+	int n ;
+	cin >> n ;
+	vector<int> data(n) ;
+	for(int i = 0; i < n; i++)
+	{
+		cin >> data[i] ;
+	}
+	vector<int> sorted ;
+	sorted = sort_custom(data) ;
+	for(int i = 0; i < n; i++)
+	{
+		cout << sorted[i] << " ";
+	}
+	cout << endl ;
+}
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sorting.h

+#include <iostream>
+#include <vector> 
+#include <algorithm>
+using namespace std ;
+
+vector<int> sort_custom(vector<int> data) ;
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