add basic implementation

sorting.cpp

+#include <iostream>
+#include <vector>
+#include "sorting.h"
+using namespace std;
+vector<int>  sort_custom(vector<int> a)
+{
+    bool swapp = true;
+    while(swapp)
+    {
+        swapp = false;
+        for (int i = 0; i < a.size()-1; i++)
+        {
+            if (a[i]>a[i+1] )
+            {
+                a[i] += a[i+1];
+                a[i+1] = a[i] - a[i+1];
+                a[i] -=a[i+1];
+                swapp = true;
+            }
+        }
+    }
+
+    return a;
+}
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