Add skeleton for storm analysis

The assingment requires a synopsis and two sections: Data Processing andResults.  Also include a Platform section providing an overview of the
working environment.
Load data from CSV file
Filter out events without costs
Scale PROPDMG and CROPDMG to actual dollar amounts
Create event category

The event type is difficult to use for analysis.  There are many cases
of multiple names describing essentially the same weather event.
Additionally there are formatting issues with this text.  Normalize
these data into a new category variable.