Add model microsphere

[adtzlr]

see #28

[codecov-commenter]

Codecov Report

Merging #29 (e2d1479) into main (06cf6a2) will decrease coverage by 0.18%. The diff coverage is 96.82%.

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   99.73%   99.54%   -0.19%     
==========================================
  Files          11       19       +8     
  Lines         381      443      +62     
==========================================
+ Hits          380      441      +61     
- Misses          1        2       +1     

Impacted Files	Coverage Δ
matadi/__about__.py	0.00% <0.00%> (ø)
matadi/_lab.py	100.00% <ø> (ø)
matadi/models/microsphere/_chain.py	80.00% <80.00%> (ø)
matadi/models/__init__.py	100.00% <100.00%> (ø)
matadi/models/microsphere/__init__.py	100.00% <100.00%> (ø)
matadi/models/microsphere/affine/__init__.py	100.00% <100.00%> (ø)
matadi/models/microsphere/affine/_models.py	100.00% <100.00%> (ø)
matadi/models/microsphere/nonaffine/__init__.py	100.00% <100.00%> (ø)
matadi/models/microsphere/nonaffine/_models.py	100.00% <100.00%> (ø)
matadi/models/microsphere/quadrature/__init__.py	100.00% <100.00%> (ø)
... and 1 more

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[adtzlr]

fixes #28