Programming Guide: Add use case/example for Conductor Actions

See: https://github.com/apache/incubator-openwhisk-wskdeploy/blob/master/tests/src/integration/conductor/manifest.yaml

Start with tests/src/integration/conductor/manifest.yaml linked in the issue, then locate the Programming Guide and compare its existing examples with this Conductor Actions case. Add a use case/example based on the manifest; done means the guide explains the case clearly enough for users to follow it.

Written by the indexing model from the issue text.