docs: add command demos

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Bencher

Report	Mon, May 20, 2024 at 15:23:28 UTC
Project	theseus-rs/rsql
Branch	add-command-demos
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	8,684,700.00
postgres-embedded	➖ (view plot)	836,880,000.00
postgresql-embedded	➖ (view plot)	846,560,000.00
rusqlite	➖ (view plot)	4,067,200.00
sqlite	➖ (view plot)	4,372,300.00

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.26%. Comparing base (a013f1e) to head (cd2f03a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #144 +/- ## ========================================== - Coverage 95.27% 95.26% -0.01% ========================================== Files 91 91 Lines 10742 10747 +5 ========================================== + Hits 10234 10238 +4 - Misses 508 509 +1 ```

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