Update README.md (#625)
Update README.md (#625)

Following the pattern in the .NET repo:  https://github.com/Azure/azure-storage-net/blob/master/README.md

Co-authored-by: Vincent Jiang (LEI) <003c49534348a2e3a9e02f090cfe1b22d3778c05@users.noreply.github.com>
Azure/azure-storage-node,Azure/azure-storage-node