Added Theme Editor window and added to Tools menu

Filtration.ThemeEditor/Views/ThemeEditorView.xaml

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+<UserControl x:Class="Filtration.ThemeEditor.Views.ThemeEditorView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:viewModels="clr-namespace:Filtration.ThemeEditor.ViewModels"
+             mc:Ignorable="d" 
+             d:DataContext="{d:DesignInstance Type=viewModels:ThemeEditorViewModel}"
+             d:DesignHeight="300" d:DesignWidth="300">
+    <Grid>
+        <TextBlock>theme editor goes here!</TextBlock>
+    </Grid>
+</UserControl>

Filtration.ThemeEditor/Views/ThemeEditorView.xaml.cs

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+namespace Filtration.ThemeEditor.Views
+{
+    public partial class ThemeEditorView
+    {
+        public ThemeEditorView()
+        {
+            InitializeComponent();
+        }
+    }
+}