Updating ARM README to ref. the Node SDK's Auth tutorial (#511)
Updating ARM README to ref. the Node SDK's Auth tutorial (#511)

This in response to issue Azure/azure-sdk-for-go#370
curoverse/azure-sdk-for-go,Azure/azure-sdk-for-go,colemickens/azure-sdk-for-go,Azure/azure-sdk-for-go,marstr/azure-sdk-for-go,Azure/azure-sdk-for-go,stubey/azure-sdk-for-go,lirao/azure-sdk-for-go,Azure/azure-sdk-for-go,marstr/azure-sdk-for-go,lirao/azure-sdk-for-go,stubey/azure-sdk-for-go,marstr/azure-sdk-for-go,curoverse/azure-sdk-for-go