GitHub support resources file (#228)

Author: SeanFeldman

.github/SUPPORT.md

@@ -0,0 +1,5 @@
+## Support resources to check prior to raising issues
+
+1. Azure Service Bus [samples](https://github.com/Azure/azure-service-bus/tree/master/samples)
+1. Already [resolved issues](https://github.com/Azure/azure-service-bus-dotnet/issues?q=is%3Aissue+is%3Aclosed)
+1. [StackOverflow](https://stackoverflow.com/questions/tagged/azureservicebus)

README.md

@@ -26,6 +26,10 @@ This library is built using .NET Standard 1.3. For more information on what plat
 
 See our [Contribution Guidelines](./.github/CONTRIBUTING.md).
 
+## How to get support
+
+See our [Support Guidelines](./.github/SUPPORT.md)
+
 ## FAQ
 
 ### Where can I find examples that use this library?