added section describing reading gage data from a file

all cleaned up

ran these

fully run notebook

added data to provide values for examples

rewrote off of new functions

removed radar lightning example

simplifying notebooks

checking that notebooks work

changed name of conda env to match repo

Updated README

cleaning up repo to only contain pyart examples

simplifying notebooks and adding functionality

updated radar tools to facilitate downloading, and added notebook

using new functions in pyart_radar_tools.py