Add project files.

Challenges/formChallenges.xaml

@@ -0,0 +1,45 @@
+<Window x:Class="SportsTrainingApp.Challenges.formChallenges"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:SportsTrainingApp.Challenges"
+        mc:Ignorable="d"
+        Title="Испытание" Height="450" Width="800" Icon="/free-icon-fitness-4729328.png" WindowStartupLocation="CenterScreen">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition></ColumnDefinition>
+            <ColumnDefinition></ColumnDefinition>
+            <ColumnDefinition></ColumnDefinition>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="0.2*"></RowDefinition>
+            <RowDefinition></RowDefinition>
+        </Grid.RowDefinitions>
+        <DataGrid Grid.Column="0" Grid.Row="3" x:Name="gridChallenges" AutoGenerateColumns="False" 
+          ColumnWidth="*" Grid.ColumnSpan="3" Margin="10" IsReadOnly="True">
+            <DataGrid.Resources>
+                <Style TargetType="TextBlock" x:Key="WrapText">
+                    <Setter Property="TextBlock.TextWrapping" Value="Wrap" />
+                </Style>
+                <Style TargetType="DataGridColumnHeader">
+                    <Setter Property="HorizontalContentAlignment" Value="Center" />
+                </Style>
+                <Style TargetType="DataGridCell">
+                    <Setter Property="HorizontalContentAlignment" Value="Center" />
+                    <Setter Property="VerticalContentAlignment" Value="Center" />
+                </Style>
+            </DataGrid.Resources>
+            <DataGrid.Columns>
+                <DataGridTextColumn Header="id" Binding="{Binding ID}" Visibility="Hidden" />
+                <DataGridTextColumn Header="Название" Binding="{Binding Name}" />
+                <DataGridTextColumn Header="Описание" Binding="{Binding Description}" ElementStyle="{StaticResource WrapText}"/>
+                <DataGridTextColumn Header="Дата начала" Binding="{Binding Start_date}" ElementStyle="{StaticResource WrapText}"/>
+                <DataGridTextColumn Header="Дата окончания" Binding="{Binding End_date}" ElementStyle="{StaticResource WrapText}"/>
+            </DataGrid.Columns>
+        </DataGrid>
+        <Button x:Name="btAddChallenges" Grid.Column="0" Grid.Row="0" Content="Добавить" Margin="10" Click="btAddChallenges_Click"/>
+        <Button x:Name="btUpdChallenges" Grid.Column="1" Grid.Row="0" Content="Изменить" Margin="10" Click="btUpdChallenges_Click"/>
+        <Button x:Name="btDelChallenges" Grid.Column="2" Grid.Row="0" Content="Удалить" Margin="10" Click="btDelChallenges_Click"/>
+    </Grid>
+</Window>