Admin repository initial commit

frontend/lib/repositories/adminRepository.dart

@@ -0,0 +1,26 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:logger/logger.dart';
+import '../models/admin.dart';
+
+final adminRepositoryProvider = Provider<AdminRepository>((_) => AdminRepository());
+
+class AdminRepository {
+  final _client = Dio(
+    BaseOptions(
+      baseUrl: 'http://10.0.2.2:3000',
+    ),
+  );
+
+  final Logger _logger = Logger();
+
+  Future<Admin?> getAdminById(String id) async {
+    try {
+      final response = await _client.get('/admin/$id');
+      return Admin.fromJson(response.data);
+    } catch (e) {
+      _logger.e(e);
+      return null;
+    }
+  }
+}