Add installation section to readme

[terror]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.12%. Comparing base (98d2e0f) to head (af4110c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files          12       12           
  Lines         431      431           
=======================================
  Hits          410      410           
  Misses         21       21           

Flag	Coverage Δ
unit	95.12% <ø> (ø)

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