Update implementations.yaml

Author: m3t3kh4n

src/assets/YAML/default/implementations.yaml

@@ -62,6 +62,7 @@ implementations:
     name: Kubernetes Admission Controller can whitelist registries and/or whitelist
       a signing key.
     tags: []
+    url: https://medium.com/slalom-technology/build-a-kubernetes-dynamic-admission-controller-for-container-registry-whitelisting-b46fe020e22d
   dependabot:
     name: dependabot
     tags: []