Add a distribute computing batch example

Create a sample that shows how to take advantage of Cloud Batch for distributed computation examples where nodes talk to each other in a low latency network. The example will will run multiple copies that pass partial results back and forth and may require using [MPI](https://www.open-mpi.org/), an HPC library.

Start with issue #345 and review the Cloud Batch and MPI entry points needed for a distributed computation sample. The work is done when a sample runs multiple copies, lets nodes exchange partial results over a low-latency network, and demonstrates the distributed computation clearly.

Written by the indexing model from the issue text.