Add project files.

Examples/Nodify.Playground/Themes/Brushes.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:o="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options">
+    
+    <SolidColorBrush x:Key="PanelBackgroundBrush"
+                     o:Freeze="True"
+                     Color="{DynamicResource PanelBackgroundColor}"
+                     Opacity="0.8" />
+    
+</ResourceDictionary>

Examples/Nodify.Playground/Themes/Dark.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="Brushes.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+    
+    <Color x:Key="PanelBackgroundColor">#1A1A1A</Color>
+    
+</ResourceDictionary>

Examples/Nodify.Playground/Themes/Light.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="Brushes.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+    
+    <Color x:Key="PanelBackgroundColor">#E9EEFE</Color>
+
+</ResourceDictionary>

Examples/Nodify.Playground/Themes/Nodify.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="Brushes.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+    
+    <Color x:Key="PanelBackgroundColor">#2A1B47</Color>
+    
+</ResourceDictionary>