Merge pull request #21 from gardener/badges

Add Badges

README.md

@@ -1,6 +1,10 @@
 # Gardener Terminal Controller Manager
 <img src="https://user-images.githubusercontent.com/5526658/65958014-a64a9b00-e44e-11e9-9b0a-166247582b05.png" width="180"/>
 
+[![CI Build status](https://concourse.ci.infra.gardener.cloud/api/v1/teams/gardener/pipelines/terminal-controller-manager-master/jobs/master-head-update-job/badge)](https://concourse.ci.infra.gardener.cloud/teams/gardener/pipelines/terminal-controller-manager-master/jobs/master-head-update-job)
+[![Slack channel #gardener](https://img.shields.io/badge/slack-gardener-brightgreen.svg?logo=slack)](https://kubernetes.slack.com/messages/gardener)
+[![Go Report Card](https://goreportcard.com/badge/github.com/gardener/terminal-controller-manager)](https://goreportcard.com/report/github.com/gardener/terminal-controller-manager)
+
 The `terminal-controller-manager` is used for the [webterminal feature](https://github.com/gardener/dashboard/blob/master/docs/Webterminals.md) of the [gardener/dashboard](https://github.com/gardener/dashboard) but is in general independant of the gardener and it's resource kinds like `Shoots`, `Seeds` etc.