Add dashboard notebook
Add dashboard notebook

Author: Michael Armbrust <michael@databricks.com>

Closes #21 from marmbrus/master.

josiahsams/spark-sql-perf-spark2.0.0,databricks/spark-sql-perf,levyx/spark-sql-perf,databricks/spark-sql-perf,dongjoon-hyun/spark-sql-perf,levyx/spark-sql-perf,dongjoon-hyun/spark-sql-perf,databricks/spark-sql-perf,josiahsams/spark-sql-perf-spark2.0.0