add readme

README.md

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+# klankschool's bardak configuration
+
+This repo encapsulated bardak as a submodule and contains
+extra configuration on how we run bardak.
+Namely, we run it in an rootless podman container
+managed by a systemd user service.
+
+To install and run:
+
+- clone this repo
+- `./build.sh`
+- `./enable-user-service.sh`
+- `systemctl --user start bardak`
+