[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/ocrdetection/test/index.test.ts

@@ -0,0 +1,12 @@
+import assert from 'assert'
+
+describe('Example:', () => {
+    /**
+     * Example
+     */
+    describe('ExampleTest', () => {
+        test('Hello World!', () => {
+            assert.strictEqual('Hello World!', 'Hello World!')
+        })
+    })
+})