Add Dockadvisor (#1222)

Author: dvigueras

README.md

@@ -548,6 +548,7 @@ Examples by:
 
 ### Linter
 
+-   [Dockadvisor](https://github.com/deckrun/dockadvisor) - Lightweight Dockerfile linter with 60+ rules, quality scoring, and security checks by [@deckrun](https://github.com/deckrun)
 -   [docker-image-size-limit](https://github.com/wemake-services/docker-image-size-limit) - A tool to keep an eye on your docker images size.
 -   [Dockerfile Linter action](https://github.com/buddy-works/dockerfile-linter) - The linter lets you verify Dockerfile syntax to make sure it follows the best practices for building efficient Docker images.
 -   [dockfmt](https://github.com/jessfraz/dockfmt) :construction: - Dockerfile formatter and parser by [@jessfraz][jessfraz]