convert: add input object document

[simleo]

Add input object document to the crate.

[simleo]

For now it's added as-is, without remapping location entries to the files in the crate.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (0c331a0) 95.64% compared to head (fd46a97) 95.68%.

❗ Current head fd46a97 differs from pull request most recent head b181ff8. Consider uploading reports for the commit b181ff8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   95.64%   95.68%   +0.03%     
==========================================
  Files          11       11              
  Lines        1517     1528      +11     
==========================================
+ Hits         1451     1462      +11     
  Misses         66       66              

Impacted Files	Coverage Δ
src/runcrate/convert.py	98.09% <100.00%> (+0.02%)	⬆️
tests/test_cwlprov_crate_builder.py	99.84% <100.00%> (+<0.01%)	⬆️

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[simleo]

For now it's added as-is, without remapping location entries to the files in the crate.

Done in b181ff8