Add changelog and a provisional contributing.md

[MichaelClerx]

Fixes #77

The contributing.md file is provisional, and should see lots of changes/updates soon

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.52%. Comparing base (62a0bd5) to head (3226510).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   90.52%   90.52%           
=======================================
  Files          11       11           
  Lines         918      918           
=======================================
  Hits          831      831           
  Misses         87       87           

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