Create a Jupyter example blog post

[jonathanl-bq]

Questions to possibly answer as part of the blog post:

• Why use the Spark Connector?
• How to use Spark ML (Vertica ML) with the Spark Connector?
• How to get started with the Spark Connector using Jupyter?

[jeremyprime]

The blog post draft is complete (on internal Vertica wiki), however we are waiting for the Vertica Demo repo to be made public before finalizing and publishing the blog post (as the example in the blog post uses that repo).