docs: Add CHANGELOG for v1.0.0

Author: magifd2

CHANGELOG.md

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+# Changelog
+
+## v1.0.0 - 2025-09-11
+
+### Added
+- Initial release of `json-to-sqlite` command-line tool.
+- Convert JSON data from standard input or file to SQLite database.
+- Automatic schema inference based on JSON structure.
+- Automatic schema evolution (add columns) for existing tables.
+- Support for various JSON data types (string, number, boolean) mapped to SQLite (TEXT, REAL, INTEGER).
+- Handles nested JSON objects and arrays by serializing them to TEXT.
+- Cross-platform build support (macOS, Linux, Windows) via `Makefile`.
+- macOS Universal Binary support.
+- Dynamic versioning from Git tags.
+- Comprehensive `README.md` (English) and `README.ja.md` (Japanese) documentation.