[IMP] Apply template

This repo needs https://github.com/OCA/oca-addons-repo-template/pull/39 to migrate an addon.

@Tecnativa TT19733

CONTRIBUTING.md

@@ -0,0 +1,10 @@
+# OCA Guidelines
+
+Please follow the official guide from the
+[OCA Guidelines page](https://odoo-community.org/page/contributing).
+
+## Project Specific Guidelines
+
+<!-- /!\ do not modify above this line -->
+
+This project does not have specific coding guidelines.