**As an** OpenProject user
**I want to** create, read, update and delete groups through the API v3
**so that** I can integrate OpenProject with other systems.

**Acceptance criteria**

* Begin of the insertionCreate group
* Delete group
* Edit group
* End of the insertion Change name Begin of the deletion of groupEnd of the deletion
* Add or remove user to a group
* Adding a user to a group creates project memberships.
* Removing a user from a group removes project memberships.
* List groups of a user
* List users of a group
* ~~List all groups of a project~~ Members, regardless of whether they are a group or a native user can already be fetched via the API.
* ~~Adding and remove groups from projects~~ Already implemented

**To be discussed**

* Begin of the insertion~~ShouldEnd of the insertion Begin of the deletion ShouldEnd of the deletion a group have an email address, e.g. for Begin of the insertionnotifications~~ (out of scope)End of the insertion Begin of the deletion notificationsEnd of the deletion