Oxidation State Document

[shyamd]

Adds a new oxidation state document and tests

[codecov-commenter]

Codecov Report

Merging #198 (4921d69) into main (7bb7485) will decrease coverage by 0.12%.
The diff coverage is 90.24%.

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   95.45%   95.33%   -0.13%     
==========================================
  Files          25       26       +1     
  Lines        1737     1778      +41     
==========================================
+ Hits         1658     1695      +37     
- Misses         79       83       +4     

Impacted Files	Coverage Δ
emmet-core/emmet/core/oxidation_states.py	90.24% <90.24%> (ø)

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