Update README.md

Author: tigoCaval

README.md

@@ -76,3 +76,5 @@ A simple didactic demonstration of the algorithm
   print_r($client->euclidean($table,"Pedro")); // result = ['C' => 1]
   print_r($client->euclidean($table,"Pedro", 2)); // result = [] ;  
 ```
+### License
+MIT license. See the archive [License](https://github.com/tigoCaval/recommendation-algorithm/blob/main/LICENSE)