README: Add more badge for README.md (pingcap#9825)

README.md

@@ -1,8 +1,11 @@
 ![](docs/logo_with_text.png)
 
+[![LICENSE](https://img.shields.io/github/license/pingcap/tidb.svg)](https://github.com/pingcap/tidb/blob/master/LICENSE)
+[![Language](https://img.shields.io/badge/Language-Go-blue.svg)](https://golang.org/)
 [![Build Status](https://travis-ci.org/pingcap/tidb.svg?branch=master)](https://travis-ci.org/pingcap/tidb)
 [![Go Report Card](https://goreportcard.com/badge/github.com/pingcap/tidb)](https://goreportcard.com/report/github.com/pingcap/tidb)
-![GitHub release](https://img.shields.io/github/tag/pingcap/tidb.svg?label=release)
+[![GitHub release](https://img.shields.io/github/tag/pingcap/tidb.svg?label=release)](https://github.com/pingcap/tidb/releases)
+[![GitHub release date](https://img.shields.io/github/release-date/pingcap/tidb.svg)](https://github.com/pingcap/tidb/releases)
 [![CircleCI Status](https://circleci.com/gh/pingcap/tidb.svg?style=shield)](https://circleci.com/gh/pingcap/tidb)
 [![Coverage Status](https://codecov.io/gh/pingcap/tidb/branch/master/graph/badge.svg)](https://codecov.io/gh/pingcap/tidb)