Initial models.py

[luke-zhu]

Define a simple data model.

Some
thing to be considered is the relationship between a dataset, images, and labels. I'm going to keep it one-to-many for now just because that makes it easier to deal with unforeseen edge cases in the future

[codecov-io]

Codecov Report

Merging #25 into master will increase coverage by 3.49%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   32.05%   35.55%   +3.49%     
==========================================
  Files          12       13       +1     
  Lines         755      796      +41     
==========================================
+ Hits          242      283      +41     
  Misses        513      513

Impacted Files	Coverage Δ
backend/__init__.py	71.79% <100%> (+4.14%)	⬆️
backend/models.py	100% <100%> (ø)

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