Add basic Odia stemming functionality

[soumendrak]

Summary

• provide a rule‑based stemmer
• expose stemmer functions in package entry point
• document stemming usage in README and docs
• add test coverage for stemming

Testing

• pytest -q

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https://chatgpt.com/codex/tasks/task_e_685ffe2cf84c832e906bdc9a0df677c6

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[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.06%. Comparing base (ac2db15) to head (7af17ae).

Files with missing lines	Patch %	Lines
openodia/stemming.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   99.49%   99.06%   -0.44%     
==========================================
  Files           9       10       +1     
  Lines         199      214      +15     
==========================================
+ Hits          198      212      +14     
- Misses          1        2       +1     

Flag	Coverage Δ
pytest	99.06% <93.33%> (-0.44%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
openodia/__init__.py	100.00% <100.00%> (ø)
openodia/stemming.py	92.85% <92.85%> (ø)

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