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

* add contributor

* add package readme

* refine ocr readme

* refine ocr readme

examples/application/js/package/packages/paddlejs-models/ocrdetection/README.md

@@ -0,0 +1,28 @@
+[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">