Create configuration_yaml_by_mf_social (#3992)

Finally tidied up my repo enough that I don't mind advertising it publicly!  Hopefully it will be of some use to somebody.

source/_cookbook/configuration_yaml_by_mf_social

@@ -0,0 +1,12 @@
++---
+ +layout: page
+ +title: "Configuration.yaml by mf_social"
+ +description: ""
+ +date: 2017-11-15 13:08 -0700
+ +sidebar: true
+ +comments: false
+ +sharing: true
+ +footer: true
+ +ha_category: Example configuration.yaml
+ +ha_external_link: https://github.com/mf-social/Home-Assistant
+ +---