add readme to the example

#### Description

this examples imports `test.json` file and `test_workflow.ga` 

from a local filesystem to Galaxy, runs this workflow and prints the output.

The workflow is quite simple - it counts lines and words (like in example 1)

and as a second step returns the last line of the result (removes header). 

The workflow was prepared in advance in Galaxy Web interface and exported to a file.  

#### To run it:

see README in a root folder