docs: add compose.yaml for metadata

Author: ahze

compose.yaml

@@ -0,0 +1,15 @@
+name: base
+
+x-daemonless:
+  title: "Base"
+  icon: ":material-docker:"
+  category: "Base"
+  description: "FreeBSD base image with s6 supervision."
+  upstream_url: "https://github.com/freebsd/freebsd-src"
+  web_url: "https://www.freebsd.org/"
+  user: "root"
+  upstream_binary: false
+  
+  docs: {}
+
+services: {}