DOC: xradar-first user guide, API reference, and gallery examples - #1876

DOC: xradar-first user guide, API reference, and gallery examples#1876

mgrover1 wants to merge 2 commits into

ARM-DOE:mainARM-DOE/pyart:mainfrom

mgrover1:pr/xradar-docsmgrover1/pyart:pr/xradar-docsCopy head branch name to clipboard