Update README.md

Author: ghost1372

dev/DevWinUI.SourceGenerator/README.md

@@ -29,7 +29,7 @@ Install-Package DevWinUI.SourceGenerator
 ```
 
 ## Example
-For generating `BreadcrumbPageMappings` you need to define `<AdditionalFiles Include="**\*.xaml" />`, for `NavigationPageMappings` you need to define `<AdditionalFiles Include="Assets\NavViewMenu\AppData.json" />` and for `<AdditionalFiles Include="Strings\en-US\Resources.resw" />` you need to define `<AdditionalFiles Include="Strings\en-US\Resources.resw" />`
+For generating `BreadcrumbPageMappings` you need to define `<AdditionalFiles Include="**\*.xaml" />`, for `NavigationPageMappings` you need to define `<AdditionalFiles Include="Assets\NavViewMenu\AppData.json" />` and for `Strings` you need to define `<AdditionalFiles Include="Strings\en-US\Resources.resw" />`
 
 ```xml
 <ItemGroup>
@@ -39,6 +39,14 @@ For generating `BreadcrumbPageMappings` you need to define `<AdditionalFiles Inc
 </ItemGroup>
 ```
 
+you can define namespace for each file in `csproj` and `PropertyGroup` section:
+
+```xml
+<StringsNamespace>myStringsNamespace</StringsNamespace>
+<NavigationMappingsNamespace>MyNavigationMappingsNamespace</NavigationMappingsNamespace>
+<BreadcrumbMappingsNamespace>MyBreadcrumbMappingsNamespace</BreadcrumbMappingsNamespace>
+```
+
 ## Demo
 
 See the [Gallery](https://github.com/Ghost1372/DevWinUI) app to see how to use it