Merge pull request #16224 from jzeferino/feature/xamarin_example_doc

Improved Xamarin example doc

examples/csharp/HelloworldXamarin/README.md

@@ -8,27 +8,29 @@ The example depends on experimental Grpc.Core nuget package that hasn't
 been officially released and is only available via the [daily builds](https://packages.grpc.io/)
 source.
 
+HINT: To download the package, please manually download the latest `.nupkg` packages from "Daily Builds" in [packages.grpc.io](https://packages.grpc.io/) into a local directory. Then add a nuget source that points to that directory (That can be [done in Visual Studio](https://docs.microsoft.com/en-us/nuget/tools/package-manager-ui#package-sources) or Visual Studio for Mac via "Configure nuget sources"). After that, nuget will also explore that directory when looking for packages.
+
 BACKGROUND
 -------------
-The example project supports Xamarin.Android and Xamarin.iOS
+The example project supports `Xamarin.Android` and `Xamarin.iOS`.
 
 For this sample, we've already generated the server and client stubs from [helloworld.proto][].
 
 PREREQUISITES
 -------------
 
-- The latest version Xamarin Studio or Visual Studio 2017 with Xamarin support installed.
+- The latest version Visual Studio 2017 or Visual Studio for Mac with Xamarin support installed.
 
 BUILD
 -------
 
-- Open the `HelloworldXamarin.sln` in Visual Studio (or Xamarin Studio)
+- Open the `HelloworldXamarin.sln` in Visual Studio (or Visual Studio for Mac)
 - Build the solution (Build -> Build All)
 
 Try it!
 -------
 
-You can deploy the example apps directly through Xamarin Studio IDE.
+You can deploy the example apps directly through Visual Studio IDE.
 Deployments can target both Android and iOS (both support physical device
 deployment as well as simulator).