Start writing the web app

Signed-off-by: Nikolai Rodionov <allanger@posteo.com>

lib/features/authorization/application/sign_in_data.dart

@@ -0,0 +1,12 @@
+import 'package:softplayer_dart_proto/accounts/v1/accounts_v1.pbgrpc.dart';
+
+class SignInData {
+  final String email;
+  final String password;
+
+  const SignInData({required this.email, required this.password});
+
+  SignInRequest toProto() {
+    return SignInRequest(email: email, password: password);
+  }
+}