[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/mini_program/ocrdetectXcx/pages/index/index.wxml

@@ -0,0 +1,29 @@
+<view>
+   <view class="img-view">
+        <text class="title">点击图片进行预测</text>
+        <scroll-view class="imgWrapper" scroll-x="true">
+            <image
+                class="img {{selectedIndex == index ? 'selected' : ''}}"
+                wx:for="{{imgList}}"
+                wx:key="index"
+                src="{{item}}"
+                mode="aspectFit"
+                bindtap="selectImage"
+                data-index="{{index}}"
+            ></image>
+            <canvas
+                canvas-id="myCanvas"
+                style="width: 960px; height: 960px; position: absolute; z-index: -1"
+            ></canvas>
+            <canvas
+                canvas-id="result"
+                style="width: 960px; height: 960px;"
+            ></canvas>
+        </scroll-view>
+        <text class="result" wx:if="{{result}}" style="height: 300rpx;">文本框选坐标：{{result}}</text>
+    </view>
+</view>
+
+<view class="mask" wx:if="{{!loaded}}">
+    <text class="loading">loading…</text>
+</view>