Setup gitpod config for ephemeral dev-environments

Signed-off-by: ArthurSens <arthursens2005@gmail.com>

.gitpod.yml

@@ -0,0 +1,8 @@
+
+tasks: 
+  - init: |
+      make --always-make
+      export PATH="$(pwd)/tmp/bin:${PATH}"
+vscode:
+  extensions:
+    - heptio.jsonnet@0.1.0:woEDU5N62LRdgdz0g/I6sQ==

README.md

@@ -2,6 +2,7 @@
 
 [![Build Status](https://github.com/prometheus-operator/kube-prometheus/workflows/ci/badge.svg)](https://github.com/prometheus-operator/kube-prometheus/actions)
 [![Slack](https://img.shields.io/badge/join%20slack-%23prometheus--operator-brightgreen.svg)](http://slack.k8s.io/)
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/prometheus-operator/kube-prometheus)
 
 > Note that everything is experimental and may change significantly at any time.