docs update

[keewis]

Right now, our docs cover less than the bare minimum. However, in order to fix that there is quite a lot to do so I'd appreciate some help.

I'm hoping to stay pretty close to the guide lines from https://documentation.divio.com/, with

• reference: everything in the Help & Reference list
• how-to guides: everything in the User Guide list
• tutorials: everything in Examples
• explanation: not sure where this should go, the guide says they are usually put into sections named something like Backgrounds or Other notes, and that they should explain background and context, and discuss alternatives and opinions. I guess we currently don't have much of these?

[codecov]

Codecov Report

Merging #20 into master will increase coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   86.91%   87.25%   +0.33%     
==========================================
  Files           7        9       +2     
  Lines         688      706      +18     
==========================================
+ Hits          598      616      +18     
  Misses         90       90              

Impacted Files	Coverage Δ
pint_xarray/accessors.py	74.82% <ø> (ø)
pint_xarray/__init__.py	100.00% <0.00%> (ø)
pint_xarray/testing.py	100.00% <0.00%> (ø)
pint_xarray/tests/test_testing.py	100.00% <0.00%> (ø)

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[keewis]

There are still a few things left to do (most notably we need examples / tutorials, and the contributing section could be better), but for now I think I'm done; let's leave those to future PRs.

I named the changelog Changelog, but we could just as well copy xarray and call it What's new. Does anyone have any preferences?

[keewis]

I also added install instructions for installing from PyPI and conda-forge, but those obviously don't work, yet.

[jthielen]

Looks like a great start to me! Just one point to discuss on using degrees in place of degrees_north/degrees_east in an example.

[keewis]

is there anything other than the name of the changelog left to discuss?

[keewis]

I figured that since we're closely tied to xarray, we might as well copy the changelog name.

Merging now, but if we find anything that still needs fixing we can do that in a new PR.