Added first draft of login and tour select page

lib/model/address.dart

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+class Address {
+  String street;
+  String housingNumber;
+  String postalCode;
+  String city;
+  String country;
+
+  Address({
+    required this.street,
+    required this.housingNumber,
+    required this.postalCode,
+    required this.city,
+    required this.country,
+  });
+}

lib/model/article.dart

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+class Article {
+  String articleId;
+
+  /// The quantity of delivered gas cylinders.
+  double quantity;
+
+  /// The price per cylinder in euros.
+  double pricePerQuantity;
+
+  /// The price of the deposit in euros per cylinder.
+  double depositPricePerQuantity;
+
+  /// The amount of cylinders delivered.
+  double quantityDelivered;
+
+  /// The amount of cylinders returned by the customer.
+  double quantityReturned;
+
+  /// The amount of cylinders left to be deposited.
+  double quantityToDeposit;
+
+  Article({
+    required this.articleId,
+    required this.quantity,
+    required this.pricePerQuantity,
+    required this.depositPricePerQuantity,
+    required this.quantityDelivered,
+    required this.quantityReturned,
+    required this.quantityToDeposit,
+  });
+}

lib/model/car.dart

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+class Car {
+  String id;
+  String carName;
+  String? driverName;
+
+  Car({required this.id, required this.carName, this.driverName});
+}

lib/model/customer.dart

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+import 'address.dart';
+
+class Customer {
+  String name;
+  String id;
+  Address address;
+
+  Customer({required this.name, required this.address, required this.id});
+}

lib/model/delivery.dart

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+import 'package:app_gaslieferung/model/receipt.dart';
+
+enum PaymentMethod { creditCard, cash }
+
+class Delivery {
+  Receipt receipt;
+
+  DateTime? deliveredAt;
+  DateTime? desiredDeliveryTime;
+  String? driverInformation;
+
+  Delivery({
+    required this.receipt,
+
+    this.desiredDeliveryTime,
+    this.driverInformation,
+    this.deliveredAt
+  });
+}

lib/model/receipt.dart

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+import 'package:app_gaslieferung/model/customer.dart';
+
+import 'article.dart';
+
+class Receipt {
+  Customer customer;
+  List<Article> articles;
+
+  double totalGrossPrice;
+  double totalNetPrice;
+
+  Receipt({
+    required this.articles,
+    required this.customer,
+    required this.totalGrossPrice,
+    required this.totalNetPrice,
+  });
+}

lib/model/supplier.dart

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+import 'package:app_gaslieferung/model/address.dart';
+
+import 'car.dart';
+
+class Supplier {
+  String id;
+  String name;
+  Address address;
+  String? phoneNumber;
+  List<Car> cars;
+
+  Supplier({
+    required this.id,
+    required this.name,
+    required this.cars,
+    required this.address,
+  });
+}

lib/model/tour.dart

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+import 'supplier.dart';
+import 'delivery.dart';
+
+class Tour {
+  DateTime date;
+  Supplier supplier;
+  List<Delivery> deliveries;
+
+  Tour({required this.date, required this.deliveries, required this.supplier});
+}