Add documentation

[dirmeier]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 50.04%. Comparing base (c7a218c) to head (cbf80d8).

Files	Patch %	Lines
sbijax/_src/nn/make_flows.py	0.00%	2 Missing ⚠️
sbijax/_src/snr.py	66.66%	2 Missing ⚠️
sbijax/_src/nn/make_snass_networks.py	0.00%	1 Missing ⚠️
sbijax/_src/nn/snass_net.py	0.00%	1 Missing ⚠️
sbijax/_src/nn/snasss_net.py	0.00%	1 Missing ⚠️
sbijax/_src/snass.py	50.00%	1 Missing ⚠️
sbijax/_src/snl.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   53.98%   50.04%   -3.95%     
==========================================
  Files          27       27              
  Lines        1256     1247       -9     
==========================================
- Hits          678      624      -54     
- Misses        578      623      +45     

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