Add install instructions to README.md

[johan-bjareholt]

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[codecov]

Codecov Report

Merging #90 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
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  Coverage   90.78%   90.78%           
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  Files          34       34           
  Lines        1606     1606           
  Branches      249      249           
=======================================
  Hits         1458     1458           
  Misses        113      113           
  Partials       35       35           

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[ErikBjare]

Might want to add to these changes another difference between using poetry install and pip install: poetry picks up the version lock file while pip picks the latest version satisfying the version constraints in the pyproject.toml (I've had trouble with that before).

[johan-bjareholt]

Might want to add to these changes another difference between using poetry install and pip install: poetry picks up the version lock file while pip picks the latest version satisfying the version constraints in the pyproject.toml (I've had trouble with that before).

Done