chore: update README.md, add project information and basic usage

[pga2rn]

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[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/simple_sqlite3_orm
__init__.py	13	3	76%	38–40
_sqlite_spec.py	36	0	100%
_table_spec.py	205	34	83%	72, 83, 87–88, 100, 112, 190, 195–197, 247, 278, 361, 363, 365–366, 414, 417, 421–423, 425–429, 431, 437, 480–481, 591–592, 606–607
_types.py	19	1	94%	27
_typing.py	11	0	100%
_utils.py	75	11	85%	40, 42–43, 46–47, 69, 84, 87, 97, 110, 134
utils.py	124	36	70%	127, 134–135, 170–173, 219, 232, 252–256, 282, 286, 333, 338–345, 357–359, 361–362, 365, 367–369, 378–379
src/simple_sqlite3_orm/_orm
__init__.py	4	0	100%
_async.py	97	9	90%	76–77, 80–81, 94–95, 97, 128, 130
_base.py	193	23	88%	109, 114–115, 196, 208, 217, 220–221, 270, 292–294, 307–309, 439, 451, 513, 525, 614, 687, 701, 724
_multi_thread.py	104	7	93%	77, 79–80, 93–94, 96, 125
_utils.py	18	2	88%	18, 40
TOTAL	899	126	85%

Tests	Skipped	Failures	Errors	Time
89	0 💤	0 ❌	0 🔥	1m 57s ⏱️

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud