Add categories to readme-vars.yml

readme-vars.yml

@@ -6,6 +6,7 @@ project_url: "https://oss.oetiker.ch/smokeping/"
 project_logo: "https://github.com/linuxserver/docker-templates/raw/master/linuxserver.io/img/smokeping-logo.png"
 project_blurb: "[{{ project_name|capitalize }}]({{ project_url }}) keeps track of your network latency. For a full example of what this application is capable of visit [UCDavis](http://smokeping.ucdavis.edu/cgi-bin/smokeping.fcgi)."
 project_lsio_github_repo_url: "https://github.com/linuxserver/docker-{{ project_name }}"
+project_categories: "Monitoring"
 # supported architectures
 available_architectures:
   - {arch: "{{ arch_x86_64 }}", tag: "amd64-latest"}