Add rudimentary sphinx docs

[lpsinger]

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[codecov-io]

Codecov Report

Merging #7 (f8b790d) into master (7e5ecf2) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   89.70%   89.78%   +0.07%     
==========================================
  Files           6        6              
  Lines         136      137       +1     
==========================================
+ Hits          122      123       +1     
  Misses         14       14              

Impacted Files	Coverage Δ
dorado/scheduling/constraints/earth_limb.py	100.00% <ø> (ø)
dorado/scheduling/constraints/orbit_night.py	80.00% <ø> (ø)
dorado/scheduling/skygrid.py	62.50% <ø> (ø)
dorado/scheduling/constraints/__init__.py	100.00% <100.00%> (ø)

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