Issue/15/metadata

[JoanneBogart]

Code to date handles only in-memory functionality for metadata.
Writing to/from files should be added before it's turned into to a (non-draft) PR.

[codecov]

Codecov Report

Merging #19 (ece1f84) into main (1c2f119) will decrease coverage by 10.52%.
The diff coverage is 43.30%.

@@             Coverage Diff              @@
##              main      #19       +/-   ##
============================================
- Coverage   100.00%   89.47%   -10.53%     
============================================
  Files            8        9        +1     
  Lines          557      684      +127     
============================================
+ Hits           557      612       +55     
- Misses           0       72       +72     

Flag	Coverage Δ
unittests	89.47% <43.30%> (-10.53%)	⬇️

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Impacted Files	Coverage Δ
tables_io/tablePlus.py	42.85% <42.85%> (ø)
tables_io/__init__.py	100.00% <100.00%> (ø)

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