add readme to the example

- on Calvera web site - go to _User->Preferences->Manage API Key_ and 

set _GALAXY_API_KEY_

#### Documentation

some documentation for Bioblend can be found here:

#### Description

This is a simple script to demonstrate how one can execute a Galaxy tool from Python.

It uploads `test.json` file from a local filesystem, runs a tool called _Line/Word/Character count_

(which has an id `wc_gnu` set in tool's xml file), waits until output dataset is ready and

export the result (outputs the amount of words and lines in `test.json` to the screen in this demo)

#### To run it:

see [README.md](../README.md) in a root folder