Edit error demo and add minimal repo

Author: liaosunny123

README.md

@@ -50,7 +50,7 @@ Add this ItemGroup in the project file (\*.csproj) of your app.
   private async Task InitializeLocalizer()
   {
       // Initialize a "Strings" folder in the executables folder.
-      StringsFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "Strings");
+      var StringsFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "Strings");
       StorageFolder stringsFolder = await StorageFolder.GetFolderFromPathAsync(StringsFolderPath);
 
       ILocalizer localizer = await new LocalizerBuilder()
@@ -207,3 +207,6 @@ In this case, we just use the `Uid` as `Name`.
     | Red | 赤 |
     | Green | 緑 |
     | Blue | 青 |
+### **Minimal example**
+Refer to [TemplateStudioWinUI3LocalizerSampleApp
+](https://github.com/AndrewKeepCoding/TemplateStudioWinUI3LocalizerSampleApp)