Update Readme with package policy (#2512)

* Update Readme with package information.

Update readme with support policy and package deprecation policy

* Update Readme.md

* Update Readme.md

Readme.md

@@ -67,6 +67,11 @@ The following packages are published from this repository:
 | - [Microsoft.ApplicationInsights.EtwCollector](http://www.nuget.org/packages/Microsoft.ApplicationInsights.EtwCollector/) | [![Nightly](https://img.shields.io/myget/applicationinsights-dotnet-nightly/v/Microsoft.ApplicationInsights.EtwCollector?label=)](https://www.myget.org/feed/applicationinsights-dotnet-nightly/package/nuget/Microsoft.ApplicationInsights.EtwCollector) | [![Nuget](https://img.shields.io/nuget/v/Microsoft.ApplicationInsights.EtwCollector.svg)](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EtwCollector/) | [![Nuget](https://img.shields.io/nuget/vpre/Microsoft.ApplicationInsights.EtwCollector.svg)](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EtwCollector/) |
 | - [Microsoft.ApplicationInsights.EventSourceListener](http://www.nuget.org/packages/Microsoft.ApplicationInsights.EventSourceListener/) | [![Nightly](https://img.shields.io/myget/applicationinsights-dotnet-nightly/v/Microsoft.ApplicationInsights.EventSourceListener?label=)](https://www.myget.org/feed/applicationinsights-dotnet-nightly/package/nuget/Microsoft.ApplicationInsights.EventSourceListener) | [![Nuget](https://img.shields.io/nuget/v/Microsoft.ApplicationInsights.EventSourceListener.svg)](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EventSourceListener/) | [![Nuget](https://img.shields.io/nuget/vpre/Microsoft.ApplicationInsights.EventSourceListener.svg)](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EventSourceListener/) |
 
+Customers are encouraged to use the latest stable version as that is the version that will get fixes and updates. 
+Beta packages are not recommended for use in production & support is limited. 
+Upon release of the new stable version, the old Beta packages will be unlisted & the old minor version will be marked as deprecated. 
+Application Insights follows the [Azure SDK Lifecycle & support policy](https://azure.github.io/azure-sdk/policies_support.html). 
+(For example: When 2.20.0 is released, 2.20.0-beta1 will be unlisted and 2.19.0 will be deprecated.)
 
 ### Nightly