add serializer

[cm-ayf]

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[codecov]

Codecov Report

Attention: 63 lines in your changes are missing coverage. Please review.

Comparison is base (dc5cf03) 82.40% compared to head (26221e7) 80.86%.

❗ Current head 26221e7 differs from pull request most recent head 4336bf2. Consider uploading reports for the commit 4336bf2 to get more accurate results

Files	Patch %	Lines
src/question/position.rs	57.42%	43 Missing ⚠️
src/serializer.rs	90.81%	18 Missing ⚠️
src/question/mod.rs	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   82.40%   80.86%   -1.55%     
==========================================
  Files           4        4              
  Lines         432      648     +216     
==========================================
+ Hits          356      524     +168     
- Misses         76      124      +48     

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