feat(useragent): initial impl

useragent/lib/screens/about.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/material.dart';
+import 'package:mtcore/markettakers.dart';
+
+class About extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return AboutScreen(decription: "Arbiter is bla bla bla");
+  }
+}

useragent/lib/screens/calc.dart

@@ -0,0 +1,74 @@
+import 'package:flutter/material.dart';
+
+class CalcScreen extends StatefulWidget {
+	const CalcScreen({super.key});
+
+	@override
+	State<CalcScreen> createState() => _CalcScreenState();
+}
+
+class _CalcScreenState extends State<CalcScreen> {
+	int _count = 0;
+
+	void _increment() {
+		setState(() {
+			_count++;
+		});
+	}
+
+	void _decrement() {
+		setState(() {
+			_count--;
+		});
+	}
+
+	void _reset() {
+		setState(() {
+			_count = 0;
+		});
+	}
+
+	@override
+	Widget build(BuildContext context) {
+		return Scaffold(
+			appBar: AppBar(
+				title: const Text('Counter'),
+			),
+			body: Center(
+				child: Column(
+					mainAxisSize: MainAxisSize.min,
+					children: [
+						const Text('Current count'),
+						const SizedBox(height: 8),
+						Text(
+							'$_count',
+							style: Theme.of(context).textTheme.displaySmall,
+						),
+						const SizedBox(height: 20),
+						Row(
+							mainAxisAlignment: MainAxisAlignment.center,
+							children: [
+								IconButton(
+									onPressed: _decrement,
+									icon: const Icon(Icons.remove_circle_outline),
+									tooltip: 'Decrement',
+								),
+								const SizedBox(width: 12),
+								ElevatedButton(
+									onPressed: _reset,
+									child: const Text('Reset'),
+								),
+								const SizedBox(width: 12),
+								IconButton(
+									onPressed: _increment,
+									icon: const Icon(Icons.add_circle_outline),
+									tooltip: 'Increment',
+								),
+							],
+						),
+					],
+				),
+			),
+		);
+	}
+}