[79992530]Garora adding luigi script

I rearranged this a bit and made a few edits based on help site doc I wrote over the weekend:

```python
"""
 Luigi is a powerful, easy-to-use framework for building data pipelines.

  This is an example Luigi script to get you started. This script is a 
  'fill in the blank' interaction. Feel free to alter it to build your pipeline.

  In this example we will run a Pig script, and then shutdown any clusters associated
  with that script.  We will do that by running the ShutdownClusters Task,
  which is dependent on RunMyExamplePigScript Task. This means the cluster will only 
  shutdown after RunMyExamplePigScript (where the data transformation happens) 
  Task is completed.

  For full tutorials and in-depth Luigi documentation, visit:
  https://help.mortardata.com/technologies/luigi
"""
```