docs: Add barricade.io to the showcase

docs/content/showcase/barricade.md

@@ -0,0 +1,13 @@
+---
+date: 2016-04-15T14:14:28+01:00
+description: "Barricade is an early warning system against hackers."
+license: ""
+licenseLink: ""
+sitelink: https://barricade.io
+tags:
+- company
+- security
+thumbnail: /img/barricade-tn.png
+title: Barricade
+---
+