test : readme

README.md

 # Crypt
 
-Crypt is a naive implementation of historical way to encrypt text. The project aim to fulfiff curiosity, to help some game, and experiment C++ practices.
+Crypt is a naive implementation of historical way to encrypt text. The project aim to fulfiff curiosity, to help some game, and experiment C++ practices.
+
+# Tests
+
+Please use dedicated test script, in the `tests` directory. Theire will provide the parameters needed by the executable