add API and data read

main.cpp

+#include<iostream>
+#include "sorting.h"
+using namespace std;
+
+int main(){
+	int  n;
+	cin>>n;
+	vector<int> v1;
+	for(int i=0;i<n;i++){
+		int e;
+		cin>>e;
+		v1.push_back(e);
+	}
+
+	vector<int> v2 = sort_custom(v1);
+	for(int i=0;i<n;i++){
+		cout<<v2[i]<<" ";
+	}
+
+	return 0;
+}
+
+

sorting.h

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