add chapter [formatting]

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sunface 2022-03-15 21:58:55 +08:00
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### 2022-03-15
- Add [Formatting](https://practice.rs/formatted-output/formatting.html)
- Add [prinln! and format!](https://practice.rs/formatted-output/println.html)
- Add [Debug and Display](https://practice.rs/formatted-output/debug-display.html)
- Add [Comments and Docs](https://practice.rs/comments-docs.html)