Merge pull request #2021 from infosiftr/kaazinga

Add deprecation notice for kaazing-gateway

kaazing-gateway/README-short.txt

@@ -1 +1 @@
-Official build of Kaazing Gateway.
+DEPRECATED; lacking active maintainer

kaazing-gateway/deprecated.md

@@ -0,0 +1 @@
+This image is deprecated due to inactivity (last updated Jul 2018; [docker-library/official-images#4575](https://github.com/docker-library/official-images/pull/4575)).