Add missing file

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/normalizers/group-member.ts

@@ -0,0 +1,12 @@
+import { normalizeAccount } from './account';
+
+import type { GroupMember as BaseGroupMember } from 'pl-api';
+
+const normalizeGroupMember = (groupMember: BaseGroupMember) => ({
+  ...groupMember,
+  account: normalizeAccount(groupMember.account),
+});
+
+type GroupMember = ReturnType<typeof normalizeGroupMember>;
+
+export { normalizeGroupMember, type GroupMember };