Add badges

Author: marcusolsson

README.md

@@ -4,6 +4,8 @@
 [![PRs welcome!](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](#contribute)
 [![Build](https://github.com/marcusolsson/grafana-json-datasource/workflows/CI/badge.svg)](https://github.com/marcusolsson/grafana-json-datasource/actions?query=workflow%3A%22CI%22)
 [![Release](https://github.com/marcusolsson/grafana-json-datasource/workflows/Release/badge.svg)](https://github.com/marcusolsson/grafana-json-datasource/actions?query=workflow%3ARelease)
+[![Marketplace](https://grafana.com/grafana/plugins/marcusolsson-json-datasource)](https://img.shields.io/badge/dynamic/json?color=orange&label=marketplace&prefix=v&query=%24.items%5B%3F%28%40.slug%20%3D%3D%20%22marcusolsson-json-datasource%22%29%5D.version&url=https%3A%2F%2Fgrafana.com%2Fapi%2Fplugins)
+[![Downloads](https://grafana.com/grafana/plugins/marcusolsson-json-datasource)](https://img.shields.io/badge/dynamic/json?color=orange&label=downloads&query=%24.items%5B%3F%28%40.slug%20%3D%3D%20%22marcusolsson-json-datasource%22%29%5D.downloads&url=https%3A%2F%2Fgrafana.com%2Fapi%2Fplugins)
 
 A data source plugin for loading JSON APIs into [Grafana](https://grafana.com).