Basic versioning description

docs/Documentation/versioning.md

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+# Versioning
+
+
+The cakephp-api supports versioning which allows for better management of features or plugins compatibility.
+
+Cakephp-api use URL versioning. With a default semantic style like v1, v2, v3
+
+**With versioning:** _www.example.com/api/**v2**/users_
+
+**Without versioning:** *www.example.com/api/users*
+
+
+
+--
+
+### Enable versioning:
+
+To enable it, you just need to turn true the configuration in the `config/api.php` 
+
+```'useVersioning' => true,```
+
+### Testing
+
+If you want to use versioingn on testing. Enable it in the  `test/Config/api.php`
+
+```'useVersioning' => true,```
+
+
+
+