project: reorganize the structure of the project.

* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.

src/Views/Init.axaml

@@ -0,0 +1,25 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             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:vm="using:SourceGit.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="SourceGit.Views.Init"
+             x:DataType="vm:Init">
+  <StackPanel Orientation="Vertical" Margin="8,0,0,0">
+    <TextBlock FontSize="18"
+               Classes="bold"
+               Text="{DynamicResource Text.Init}"/>
+    <Grid Margin="0,16,8,0" RowDefinitions="28,28" ColumnDefinitions="120,*">
+      <TextBlock Grid.Row="0" Grid.Column="0"
+             Text="{DynamicResource Text.Init.Path}"
+             HorizontalAlignment="Right" VerticalAlignment="Center"
+             Margin="0,0,8,0"/>
+      <TextBlock Grid.Row="0" Grid.Column="1"
+             Text="{Binding TargetPath}"/>
+      <TextBlock Grid.Row="1" Grid.Column="1"
+             Text="{DynamicResource Text.Init.Tip}"
+             Foreground="{DynamicResource Brush.FG2}"/>
+    </Grid>
+  </StackPanel>
+</UserControl>