add secured doc

src/components/Authorized/demo/secured.md

+---
+order: 1
+title: 
+  zh-CN: 注解
+  en-US: secured
+---
+
+```jsx
+import RenderAuthorized from 'ant-design-pro/lib/Authorized';
+import { Alert } from 'antd';
+
+const { Secured } = RenderAuthorized('user');
+const noMatch = <Alert message="No permission." type="error" showIcon />;
+
+const havePermission = () => {
+  return false;
+};
+
+const havePermissionAsync = new Promise((resolve, reject) => {
+  // Call reslove on behalf of passed
+  setTimeout(() => reslove(), 1000);
+});
+
+@Secured('admin', noMatch)
+class TestSecuredString extends React.Component {
+  render() {
+    <Alert message="user Passed!" type="success" showIcon />;
+  }
+}
+
+@Secured(['user', 'admin'], noMatch)
+class TestSecuredArray extends React.Component {
+  render() {
+    <Alert
+      message="Use Array as a parameter passed!"
+      type="success"
+      showIcon
+    />;
+  }
+}
+
+@Secured(havePermission, noMatch)
+class TestSecuredFunction extends React.Component {
+  render() {
+    <Alert
+      message="Use function as a parameter passed!"
+      type="success"
+      showIcon
+    />;
+  }
+}
+
+@Secured(havePermissionAsync, noMatch)
+class TestSecuredPromise extends React.Component {
+  render() {
+    <Alert
+      message="Use Promise as a parameter passed!"
+      type="success"
+      showIcon
+    />;
+  }
+}
+
+ReactDOM.render(
+  <div>
+    <TestSecuredString />
+    <TestSecuredArray />
+    <TestSecuredFunction />
+    <TestSecuredPromise />
+  </div>,
+  mountNode,
+);
+```