Added placeholder for lastName and role addition functionality

frontend/pshared/lib/provider/invitations.dart

@@ -30,6 +30,7 @@ class InvitationsProvider extends GenericProvider<Invitation> {
     required String roleRef,
     required String inviterRef,
     String name = '',
+    String lastName = '',
     String comment = '',
     DateTime? expiresAt,
   }) async {
@@ -39,6 +40,7 @@ class InvitationsProvider extends GenericProvider<Invitation> {
       inviterRef: inviterRef,
       email: email,
       name: name,
+      lastName: lastName,
       comment: comment,
       expiresAt: expiresAt,
     );

frontend/pshared/lib/provider/permissions.dart

@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:collection/collection.dart';
 
 import 'package:pshared/api/requests/change_role.dart';
+import 'package:pshared/models/describable.dart';
 import 'package:pshared/models/permissions/access.dart';
 import 'package:pshared/models/permissions/action.dart' as perm;
 import 'package:pshared/models/permissions/data/permission.dart';
@@ -101,6 +102,32 @@ class PermissionsProvider extends ChangeNotifier {
     return _performServiceCall(() => PermissionsService.deleteRoleDescription(descRef));
   }
 
+  Future<RoleDescription?> createRoleDescription({
+    required String name,
+    String? description,
+  }) async {
+    if (!_organizations.isOrganizationSet) {
+      throw StateError('Organization is not set');
+    }
+    final normalizedName = name.trim();
+    final normalizedDescription = description?.trim();
+    final roleDescription = RoleDescription.build(
+      organizationRef: _organizations.current.id,
+      roleDescription: newDescribable(name: normalizedName, description: normalizedDescription),
+    );
+
+    await _performServiceCall(() => PermissionsService.createRoleDescription(roleDescription));
+    final matches = roleDescriptions.where(
+      (role) =>
+        role.organizationRef == _organizations.current.id &&
+        role.name == normalizedName &&
+        (role.description ?? '') == (normalizedDescription ?? ''),
+    ).toList()
+      ..sort((a, b) => b.createdAt.compareTo(a.createdAt));
+
+    return matches.isEmpty ? null : matches.first;
+  }
+
   Future<UserAccess?> createPermissions(List<Policy> policies) {
     return _performServiceCall(() => PermissionsService.createPolicies(policies));
   }