Add craft.ai to Friends

Fixes #570

Author: steveklabnik

_data/users.yml

@@ -97,6 +97,11 @@
   url: http://www.coturnix.fr/
   logo: coturnix.png
   how: "Machine learning and optimization for minimizing energy consumption in buildings."
+-
+  name: craft.ai
+  url: http://craft.ai
+  logo: craftai.png
+  how: "Our core engine is written in Rust."
 -
   name: Dropbox
   url: https://www.dropbox.com