Add a example project for testing and showcase

[shimizukawa]

Feature or Bugfix

• Feature

Purpose

• example applications for testing and showcase

Detail

• examples/proj1 provides testapp models in the tests directory
• GitHub Actions run:
  • makemigrations
  • sqlmigrate

For now, the test will fail because of a bug in sqlmigrate.

Relates

• nothing

[codecov]

Codecov Report

Merging #91 (e81c87d) into master (4fd73cd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   47.01%   47.01%           
=======================================
  Files           3        3           
  Lines         251      251           
  Branches       62       68    +6     
=======================================
  Hits          118      118           
  Misses        123      123           
  Partials       10       10           

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