Added new Models and Razor Template

WGneu/Windows/AreaCommitmentListWindow.xaml.cs

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+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+using WGneu.Models;
+
+namespace WGneu.Windows
+{
+    /// <summary>
+    /// Interaction logic for AreaCommitmentListWindow.xaml
+    /// </summary>
+    public partial class AreaCommitmentListWindow : Window {
+        private readonly WgContext Context = new();
+
+        public AreaCommitmentListWindow(Member member) {
+            InitializeComponent();
+        }
+
+        private void RefreshContractList() {
+            Context.Members.Load();
+            List<Contract> contracts = Context.Contracts.OrderBy(c => c.MgNr).ToList();
+
+            ContractList.ItemsSource = contracts;
+            if (contracts.Count == 1)
+                ContractList.SelectedIndex = 0;
+        }
+
+        private void ContractList_SelectionChanged(object sender, SelectionChangedEventArgs e) {
+            RefreshContractList();
+        }
+    }
+}