#21: Add superuser routes (#30)

* Add CRU superuser routes

* Add delete method on DB adapters

* Add superuser delete route

* Add superuser routes documentation

* Pass black formatter

fastapi_users/db/sqlalchemy.py

@@ -57,3 +57,7 @@ class SQLAlchemyUserDatabase(BaseUserDatabase):
         )
         await self.database.execute(query)
         return user
+
+    async def delete(self, user: BaseUserDB) -> None:
+        query = self.users.delete().where(self.users.c.id == user.id)
+        await self.database.execute(query)