✨ Add tagging commands

[jossmoff]

Description

Provides the ability to tag and untag stories
Fixes #29

Type of change

Please tick options that are relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #30 (9d9a56d) into main (51199b6) will increase coverage by 0.40%.
The diff coverage is 100.00%.

❗ Current head 9d9a56d differs from pull request most recent head 2a0e378. Consider uploading reports for the commit 2a0e378 to get more accurate results

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   93.57%   93.97%   +0.40%     
==========================================
  Files          11       11              
  Lines         420      448      +28     
==========================================
+ Hits          393      421      +28     
  Misses         27       27              

Files	Coverage Δ
bookshelf/__init__.py	100.00% <100.00%> (ø)
bookshelf/models.py	73.25% <100.00%> (+2.74%)	⬆️
test/test_models.py	100.00% <100.00%> (ø)

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