Add monotron

Author: TeXitoi

data.yml

@@ -22,6 +22,11 @@
     of any size. The firmware allow you to customize each key as you wish:
     a layer change, a key combo or a regular key.
   image: https://raw.githubusercontent.com/TeXitoi/keyberon/master/images/keyberon.jpg
+- name: Monotron
+  website: https://github.com/thejpster/monotron
+  author_website: https://thejpster.org.uk/
+  description: A simple 1980's home computer style application for the Tiva-C Launchpad
+  image: https://raw.githubusercontent.com/thejpster/monotron/master/screenshot.jpg
 
 # Template for new entries