Docs/Docstring updates

[kmuehlbauer]

• add PULL_REQUEST_TEMPLATE.md
• fixes docstrings/docs with regard to intersphinx/cross-referencing
• updates classiefiers

[codecov]

Codecov Report

Merging #89 (587dbc1) into main (50887fb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   87.75%   87.75%           
=======================================
  Files          19       19           
  Lines        3284     3284           
=======================================
  Hits         2882     2882           
  Misses        402      402           

Flag	Coverage Δ
unittests	87.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xradar/accessors.py	59.32% <ø> (ø)
xradar/georeference/projection.py	82.75% <ø> (ø)
xradar/georeference/transforms.py	100.00% <ø> (ø)
xradar/io/backends/cfradial1.py	86.39% <ø> (ø)
xradar/io/backends/furuno.py	91.41% <ø> (ø)
xradar/io/backends/gamic.py	86.16% <ø> (ø)
xradar/io/backends/iris.py	84.85% <ø> (ø)
xradar/io/backends/odim.py	88.13% <ø> (ø)
xradar/io/backends/rainbow.py	90.14% <ø> (ø)
xradar/io/export/cfradial2.py	34.78% <ø> (ø)
... and 2 more

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[mgrover1]

@kmuehlbauer good to merge?

[kmuehlbauer]

Yep. 👍