Add tutorial: Azure Blob Storage

[sesi]

Currently there is not a Knowledge Base tutorial for Azure Blob Storage.

I'm interested in contributing a new tutorial for Azure Blob Storage to the docs and creating a PR for this change.

Should be very similar to the existing S3 tutorial (creating a bucket + file, provisioning access keys, adding to secrets, etc.).

[randyzwitch]

For both of your submitted issues, if you're willing to write these tutorials up we'd be happy to review them!