docs: Add clearhaus.com to the showcase

docs/content/showcase/clearhaus.md

@@ -0,0 +1,14 @@
+---
+date: 2016-10-21T12:37:00+02:00
+description: "Online Acquiring · Accept Visa & MasterCard within 1-3 days"
+license: ""
+licenseLink: ""
+sitelink: https://www.clearhaus.com/
+tags:
+  - company
+  - fintech
+  - payments
+  - acquirer
+thumbnail: /img/clearhaus-tn.png
+title: Clearhaus
+---