Added Code Climate, CodeBeat badges. (cvat-ai#995)

Author: nmanovic

README.md

@@ -4,6 +4,8 @@
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/840351da141e4eaeac6476fd19ec0a33)](https://app.codacy.com/app/cvat/cvat?utm_source=github.com&utm_medium=referral&utm_content=opencv/cvat&utm_campaign=Badge_Grade_Dashboard)
 [![Gitter chat](https://badges.gitter.im/opencv-cvat/gitter.png)](https://gitter.im/opencv-cvat)
 [![Coverage Status](https://coveralls.io/repos/github/opencv/cvat/badge.svg?branch=)](https://coveralls.io/github/opencv/cvat?branch=develop)
+[![Maintainability](https://api.codeclimate.com/v1/badges/0461727199dfe049b2f1/maintainability)](https://codeclimate.com/github/opencv/cvat/maintainability)
+[![codebeat badge](https://codebeat.co/badges/53cd0d16-fddc-46f8-903c-f43ed9abb6dd)](https://codebeat.co/projects/g.yxqyang.asia-opencv-cvat-develop)
 [![DOI](https://zenodo.org/badge/139156354.svg)](https://zenodo.org/badge/latestdoi/139156354)
 
 CVAT is free, online, interactive video and image annotation tool for computer vision. It is being used by our team to annotate million of objects with different properties. Many UI and UX decisions are based on feedbacks from professional data annotation team.