Add an accommodations reservations module (#188)

Add a new module to enable accommodations reservation

![](https://gitea.communiquons.org/attachments/de1f5b12-0a93-40f8-b29d-97665daa6fd5)

Reviewed-on: #188

geneit_backend/src/services/mod.rs

@@ -1,5 +1,8 @@
 //! # Backend services
 
+pub mod accommodations_list_service;
+pub mod accommodations_reservations_calendars_service;
+pub mod accommodations_reservations_service;
 pub mod couples_service;
 pub mod families_service;
 pub mod login_token_service;