change name as in contribute.md

sorting/gnome_sort.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+
+void gnomesort(int arr[], int size) {
+    // few easy cases
+    if (size <= 1) return;
+
+    int index = 0;  // initialize some variables.
+    while (index < size) {
+        // check for swap
+        if ((index == 0) || (arr[index] >= arr[index - 1])) {
+            index++;
+        } else {
+            swap(arr[index], arr[index - 1]);  // swap
+            index--;
+        }
+    }
+}
+// Our main function
+int main() {
+    int arr[] = {-2, -10, 100, 35, 34, 99};
+    int size = sizeof(arr) / sizeof(arr[0]);
+
+    gnomesort(arr, size);
+
+    for (int i = 0; i < size; i++) printf("%d ", arr[i]);
+
+    return 0;
+}