Add OpenXLab Badge (#1985)

* Update README.md

* Update README_zh-CN.md

README.md

@@ -26,6 +26,7 @@
 [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/open-mmlab/mmocr.svg)](https://github.com/open-mmlab/mmocr/issues)
 [![Percentage of issues still open](https://isitmaintained.com/badge/open/open-mmlab/mmocr.svg)](https://github.com/open-mmlab/mmocr/issues)
 <a href="https://console.tiyaro.ai/explore?q=mmocr&pub=mmocr"> <img src="https://tiyaro-public-docs.s3.us-west-2.amazonaws.com/assets/try_on_tiyaro_badge.svg"></a>
+[![Open in OpenXLab](https://cdn-static.openxlab.org.cn/app-center/openxlab_demo.svg)](https://openxlab.org.cn/apps?search=mmocr)
 
 [📘Documentation](https://mmocr.readthedocs.io/en/dev-1.x/) |
 [🛠️Installation](https://mmocr.readthedocs.io/en/dev-1.x/get_started/install.html) |

README_zh-CN.md

@@ -26,6 +26,7 @@
 [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/open-mmlab/mmocr.svg)](https://github.com/open-mmlab/mmocr/issues)
 [![Percentage of issues still open](https://isitmaintained.com/badge/open/open-mmlab/mmocr.svg)](https://github.com/open-mmlab/mmocr/issues)
 <a href="https://console.tiyaro.ai/explore?q=mmocr&pub=mmocr"> <img src="https://tiyaro-public-docs.s3.us-west-2.amazonaws.com/assets/try_on_tiyaro_badge.svg"></a>
+[![Open in OpenXLab](https://cdn-static.openxlab.org.cn/app-center/openxlab_demo.svg)](https://openxlab.org.cn/apps?search=mmocr)
 
 [📘文档](https://mmocr.readthedocs.io/zh_CN/dev-1.x/) |
 [🛠️安装](https://mmocr.readthedocs.io/zh_CN/dev-1.x/get_started/install.html) |