Add ref and label to serialization helper

Author: josesimoes

README.md

@@ -11,6 +11,8 @@
 | Component | Build Status | NuGet Package |
 |:-|---|---|
 | nanoFramework.System.Runtime.Serialization | [![Build Status](https://dev.azure.com/nanoframework/System.Runtime.Serialization/_apis/build/status/nanoframework.System.Runtime.Serialization?branchName=main)](https://dev.azure.com/nanoframework/System.Runtime.Serialization/_build/latest?definitionId=101&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Runtime.Serialization.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Runtime.Serialization/) |
+| nanoFramework.Serialization.Helper | [![Build Status](https://dev.azure.com/nanoframework/System.Runtime.Serialization/_apis/build/status/nanoframework.System.Runtime.Serialization?branchName=main)](https://dev.azure.com/nanoframework/System.Runtime.Serialization/_build/latest?definitionId=101&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.Serialization.Helper.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.Serialization.Helper/) |
+
 
 ## Usage