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[Doc] add readme for js packages (#421)

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* add contributor

* add package readme

* refine ocr readme

* refine ocr readme
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[中文版](./README_cn.md)
# ocr_detection
ocr_detection model is used to detect the text area in the image.
<img src="https://img.shields.io/npm/v/@paddle-js-models/ocrdet?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/ocrdet" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/ocrdet?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/ocrdet" alt="downloads">
The ocr_detection model is compressed from [PP-OCRv3](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.6/doc/doc_en/PP-OCRv3_introduction_en.md) which released by [PaddleOCR](https://github.com/PaddlePaddle/PaddleOCR), which greatly improves the running speed on js at a small loss of accuracy.
# Usage
```js
import * as ocr from '@paddle-js-models/ocrdet';
// Load ocr_detect model
await ocr.load();
// Get text area points
const res = await ocr.detect(img);
```
# Online experience
https://paddlejs.baidu.com/ocrdet
# Performance
<img alt="image" src="https://user-images.githubusercontent.com/43414102/156394295-5650b6c5-65c4-42a7-bccc-3ed459577b9d.png">

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[English](./README.md)
# ocr_detection
ocr_detection模型用于检测图像中文字区域。
<img src="https://img.shields.io/npm/v/@paddle-js-models/ocrdet?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/ocrdet" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/ocrdet?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/ocrdet" alt="downloads">
ocr_detection模型是[PaddleOCR](https://github.com/PaddlePaddle/PaddleOCR)发布[PP-OCRv3](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.6/doc/doc_ch/PP-OCRv3_introduction.md)模型的压缩版本，压缩后的模型仅0.47M，在损失一小部分精度的情况下，大幅提升在js上的运行速度。
# 使用
```js
import * as ocr from '@paddle-js-models/ocrdet';
// ocr_detect模型加载
await ocr.load();
// 获取文字区域坐标
const res = await ocr.detect(img);
```
# 效果
<img alt="image" src="https://user-images.githubusercontent.com/43414102/156394295-5650b6c5-65c4-42a7-bccc-3ed459577b9d.png">