[Model] add Paddle.js web demo (#392)

* add application include paddle.js web demo and xcx

* cp PR #5

* add readme

* fix comments and link

* fix xcx readme

* fix Task 1

* fix bugs

* refine readme

* delete ocrxcx readme

* refine readme

* fix bugs

* delete old readme

* 200px to 300px

* revert 200px to 300px

Co-authored-by: Jason <jiangjiajun@baidu.com>

examples/application/js/web_demo/packages/paddlejs-models/detect/src/index.ts

@@ -0,0 +1,29 @@
+/**
+ * @file detect model
+ */
+
+import { Runner } from '@paddlejs/paddlejs-core';
+import '@paddlejs/paddlejs-backend-webgl';
+
+let detectRunner = null as Runner;
+
+export async function init() {
+    detectRunner = new Runner({
+        modelPath: 'https://paddlejs.bj.bcebos.com/models/fuse/detect/detect_fuse_activation/model.json',
+        fill: '#fff',
+        mean: [0.5, 0.5, 0.5],
+        std: [0.5, 0.5, 0.5],
+        bgr: true,
+        keepRatio: false,
+        webglFeedProcess: true
+    });
+
+    await detectRunner.init();
+}
+
+export async function detect(image) {
+    const output = await detectRunner.predict(image);
+    // 阈值
+    const thresh = 0.3;
+    return output.filter(item => item[1] > thresh);
+}