added devcontainer with all tools for frontent (deno, nextjs) and backend (dart, go)

backend-dart/lib/infrastructure/config/config.dart

@@ -0,0 +1,20 @@
+import 'dart:io';
+import 'package:yaml/yaml.dart';
+
+class Config {
+  final String databaseUrl;
+  final String port;
+
+  Config({required this.databaseUrl, required this.port});
+
+  static Future<Config> load() async {
+    final file = File('config.yaml');
+    final content = await file.readAsString();
+    final config = loadYaml(content);
+
+    return Config(
+      databaseUrl: config['database']['url'],
+      port: config['server']['port'],
+    );
+  }
+}