Add changelog

changelog/unreleased/builtin-regular-users.md

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+Change: Set user role on builtin users
+
+We now set the default `user` role on our builtin users.
+
+https://github.com/owncloud/ocis-accounts/pull/102

changelog/unreleased/new-admin-user.md

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+Change: Add new builtin admin user
+
+We added a new builtin user `moss` and assigned the admin role.
+
+https://github.com/owncloud/ocis-accounts/pull/102