Minimum spec for inventory management

[Zaph-x]

This pull request adds a minimal inventory management system to stregsystemet. The idea is to be able to get historical data from stregsystemet about what products sell well, and what products do not sell well.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.59811% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 55.12%. Comparing base (af0efd8) to head (955f409).
Report is 4 commits behind head on next.

Files	Patch %	Lines
stregsystem/tests.py	90.99%	29 Missing ⚠️
stregsystem/models.py	84.09%	12 Missing and 2 partials ⚠️
stregsystem/admin.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #274      +/-   ##
==========================================
+ Coverage   53.45%   55.12%   +1.66%     
==========================================
  Files          33       33              
  Lines        4553     5094     +541     
  Branches      267      287      +20     
==========================================
+ Hits         2434     2808     +374     
- Misses       2069     2234     +165     
- Partials       50       52       +2     

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[falkecarlsen]

@krestenlaust consider this a good project for future F-acking events. We have a wireless USB barcode-scanner for use with some frontend. A WIP frontend that is stand-alone is available here https://github.com/joandrsn/inventory

[krestenlaust]

@krestenlaust consider this a good project for future F-acking events. We have a wireless USB barcode-scanner for use with some frontend. A WIP frontend that is stand-alone is available here https://github.com/joandrsn/inventory

Thanks for the inspiration, having an inventory system would be really awesome! I'll bookmark it for now, but I'll look into it when I get the time.