Add installing instructions

[andrewdavidmackenzie]

Fixes #347

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 32%. Comparing base (30afdc7) to head (f4c0385).
Report is 2 commits behind head on master.

Files	Patch %	Lines
tests/piglet.rs	95%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #352   +/-   ##
=====================================
+ Coverage      32%    32%   +1%     
=====================================
  Files          37     37           
  Lines        4340   4355   +15     
=====================================
+ Hits         1378   1393   +15     
  Misses       2962   2962           

Flag	Coverage Δ
unittests	32% <95%> (+1%)	⬆️

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