Improve the README file

Author: williamdes

README.md

@@ -1,2 +1,11 @@
-# docker-phpunit
-A docker image for phpunit
+# A Docker image to run phpunit
+
+|Series|Badges|
+|------|------|
+|7.x.x|![Build docker image](https://github.com/sudo-bot/docker-phpunit/workflows/Build%20docker%20image/badge.svg?branch=7)|
+|8.x.x|![Build docker image](https://github.com/sudo-bot/docker-phpunit/workflows/Build%20docker%20image/badge.svg?branch=8)|
+|9.x.x|![Build docker image](https://github.com/sudo-bot/docker-phpunit/workflows/Build%20docker%20image/badge.svg?branch=9)|
+
+Go to [Doctum](https://github.com/sebastianbergmann/phpunit#readme) at GitHub
+
+You can find the image on [Docker Hub](https://hub.docker.com/r/botsudo/phpunit)