Update Readme.txt

Update Designer support comment
Add MSDN reference for changing solution platform.

NuGet/Readme.txt

@@ -6,11 +6,11 @@ Background:
 
 Post Installation:
   - Read the release notes for your version https://github.com/cefsharp/CefSharp/releases (Any known issues will be listed here)
-  - Set either `x86` or x64` as your target architecture. `AnyCpu` support was added in `51`, please see the release notes for details as additional steps are required to make it work.
+  - Set either `x86` or x64` as your target architecture (See https://msdn.microsoft.com/en-us/library/ms185328.aspx#Anchor_0 for details). `AnyCpu` support in versions > `51.0.0`, please see the release notes for details as additional steps are required to make it work.
   - After installing the `Nuget` package we recommend closing Visual Studio completely and then reopening (This ensures your references show up and you have full intellisense).
   - Check your output `\bin` directory to make sure the appropriate references have been copied.
   - Build fails even though packages are installed. Short term rebuild again and everything should be find. Long term we recommend reading http://www.xavierdecoster.com/migrate-away-from-msbuild-based-nuget-package-restore
-  - If you are using `WPF`, please note there is no Designer support at this point in time, see the FAQ for details.
+  - Minimal designer support was added in version `57.0.0 for both `WinForms` and `WPF`. For older versions there is no designer support (designer will throw an exception).
 
 Deployment:
   - Make sure `Visual C++ 2013` is installed (`x86` or x64` depending on your build) or you package the runtime dlls with your application, see the FAQ for details.