Add project files.

Examples/Nodify.Calculator/FlowRunner.xaml

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+<Window x:Class="Nodify.Calculator.FlowRunner"
+        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:Nodify.Calculator"
+        mc:Ignorable="d"
+        Loaded="Window_Loaded"
+        Title="FlowRunner" Height="450" Width="800" ResizeMode="NoResize" WindowStartupLocation="CenterOwner">
+    <Grid>
+        <RichTextBox x:Name="LogRichTextBox"
+                     IsReadOnly="True"
+                     VerticalScrollBarVisibility="Auto"
+                     Background="#FF2D2D30"
+                     Foreground="White"
+                     FontFamily="Consolas"
+                     FontSize="14"
+                     BorderThickness="0">
+            <!-- Initialize with an empty document -->
+            <FlowDocument />
+        </RichTextBox>
+    </Grid>
+</Window>