Add Docker Hub and Github links to the README

README.md

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 This Docker image includes the [BorgBackup](https://borgbackup.readthedocs.io/en/stable/) client utility and sshfs support. Borg is a deduplicating archiver with compression and authenticated encryption. It's very efficient, doesn't require regular full backups, and supports data pruning.
 
+Docker Hub: https://hub.docker.com/r/pschiffe/borg
+
+Source GitHub repository: https://github.com/pschiffe/docker-borg
+
 ## Quick start
 
 First, pull the image to keep it up to date. Then create and run the borg backup container. In this quick start, the `/etc` and `/home` directories from the host are bind mounted to the container as read only. These are the directories which will be backed up. The backed up data will be stored in the `borg-repo` Docker volume, and the data will be protected with the `my-secret-pw` password. If the host is using SELinux, use the `--security-opt label:disable` flag. This is because we don't want to relabel the `/etc` and `/home` directories, but we do want the container to have access to them. After the backup is done, data will be pruned according to the default policy and checked for errors. Borg runs in verbose mode within the container, which means it will print detailed output from the backup. At the end, the container is deleted. This is done using a separate `docker rm` command. We do this because the `--rm` option in `docker run` would also remove the Docker volumes, which we don't want. By deleting the container and pulling the image from the registry each time, we ensure the container is fresh for each backup run.