Created project base structure, state management, router and login

lib/services/api_client.dart

@@ -0,0 +1,19 @@
+import 'package:dio/dio.dart';
+
+import 'package:my_linkding/models/server_instance.dart';
+import 'package:my_linkding/utils/http_request_client.dart';
+
+final dio = Dio();
+
+class ApiClient {
+  final ServerInstance serverInstance;
+
+  const ApiClient({
+    required this.serverInstance,
+  });
+
+  Future<bool> checkConnectionInstance() async {
+    final result = await HttpRequestClient.get(urlPath: "/bookmarks/?limit=1", server: serverInstance);
+    return result.successful;
+  }
+}