Add Gitpod support

[Coteh]

Also contains an .env.example with some defaults for the docker-compose stack currently in the project.

[codecov]

Codecov Report

Merging #305 (2f1bcb3) into development (f046bb5) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #305   +/-   ##
============================================
  Coverage        53.91%   53.91%           
============================================
  Files               15       15           
  Lines             1137     1137           
============================================
  Hits               613      613           
  Misses             524      524           

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[gitpod-io]