Ok, Just Do It!

docs/help/apply-themes.md

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+# Apply themes with App.xaml 
+
+`App.xaml`
+```xml
+<ResourceDictionary>
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="/brightsharp;component/generic.xaml" />
+        
+    </ResourceDictionary.MergedDictionaries>
+
+</ResourceDictionary>
+```
+
+# Apply themes by ThemeManager
+
+Use enumeration at singleton
+```c#
+    ThemeManager.CurrentTheme = ColorThemes.Classic;
+```
+
+## NOTE
+It is recommended use `Background="{DynamicResource WindowBackgroundBrush}"` for Window markup