v.0.1.0: Add initial project structure and configuration files for CSVT library

- Created .eslintrc.json for ESLint configuration with TypeScript support.
- Added .gitignore to exclude unnecessary files and directories.
- Introduced .prettierrc.json for code formatting settings.
- Initialized package.json with project metadata, dependencies, and scripts for building, testing, and formatting.
- Added README.md with project overview, features, installation instructions, and usage examples.
- Created tsconfig.json for TypeScript compiler options.
- Set up vitest.config.ts for testing configuration using Vitest.
- Added project structure documentation in project_structure.md.
- Included CSVT specification in spec.md and spec-ja.md.
- Implemented basic usage example in examples/basic-usage.ts.
- Developed core library functionality in src/ directory, including parsing, validation, and utility functions.
- Added tests for core functionality in tests/ directory using Vitest.