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

backend-dart/lib/interfaces/http/server.dart

@@ -0,0 +1,21 @@
+import 'dart:io';
+
+import 'package:backend_dart/infrastructure/config/config.dart';
+
+class Server {
+  final Config config;
+
+  Server(this.config);
+
+  Future<void> start() async {
+    final server =
+        await HttpServer.bind(InternetAddress.anyIPv4, int.parse(config.port));
+    print('Listening on port ${config.port}');
+
+    await for (HttpRequest request in server) {
+      request.response
+        ..write('Welcome to ActaTempus!')
+        ..close();
+    }
+  }
+}