docs: update README

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Ayo 2022-09-19 12:02:48 +02:00
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commit 941641ce8b

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### Installation
`npm i generate-timezone-json`
### Usage
1. Run: `generate-timezone-json` to generate timezones.json from official IANA Database,
- this will generate a file named "timezones.json" with data coming from the official IANA database
### Planned features (not yet implemented)
1. To generate timezones.json from a TAB file, run: `generate-timezone-json <filename>`
- for example, using a file named "zone.tab": `generate-timezone-json zone.tab`
2. Specify an output directory with option `--outDir`: `generate-timezone <filename> --outDir <directory>`