Create the page allowing to create/update a government
This page can be used by a super-admin or by the admin of a pooling organization (see #18 (closed)). The page must allow
- specifying the code, the name and the osm_id of the government
- specifying the set of issue categories handled by the government
- for each group of categories, specifying an optional contact email address: each time an issue is created on this government, with a category of that group, an email must be sent to that contact address