Added image to README.md

Author: jkarlosb

README.md

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 # git-server-docker
 A lightweight Git Server Docker image built with Alpine Linux. Available on [GitHub](https://github.com/jkarlosb/git-server-docker) and [Docker Hub](https://hub.docker.com/r/jkarlos/git-server-docker/)
 
+!["image git server docker" "git server docker"](https://github.com/jkarlosb/git-server-docker/blob/master/git-server-docker.jpg)
+
 ### Basic Usage
 
 How to run the container in port 2222 with two volumes, keys volume for public keys and repos volume for git repositories: