Add gntech.se to the showcase

docs/content/showcase/gntech.md

@@ -0,0 +1,15 @@
+---
+date: 2016-02-13T21:47:27+01:00
+description: "Projects, music and drawings, the personal web page of Gustav Näslund"
+license: ""
+licenseLink: ""
+sitelink: http://www.gntech.se/
+tags:
+- personal
+- blog
+- projects
+- music
+- drawings
+thumbnail: /img/gntech-tn.png
+title: gntech.se
+---