add basic implementation

sorting.cpp

+#include <iostream>
+#include "sorting.h"
+using namespace std;
+
+vector<int> sort_custom(vector<int> v)
+{
+    for(int i = 0; i < v.size(); i++)
+    {
+        int count = 0;
+        for(int j = 0; j < v.size()-1; j++)
+        {
+            if (v[j] > v[j+1]) {
+                count++;
+                int temp = v[j];
+                v[j] = v[j+1];
+                v[j+1] = temp;
+            }
+        }
+        if (count==0) {
+            return v;
+        }
+    }
+    return v;
+}