This is my first time try to use the plugin.
The steps I have proceed,

1. download the latest plugin Polychromatic.xcplugin.zip from "release"
2. create a new directory
3. close Xcode and reopen it.

$ls
Polychromatic.xcplugin/

$pwd
/Users/heefan/Library/Application Support/Developer/Shared/Xcode/Plug-ins

I cannot find anything about Polychromatic on my Fonts & Color
I am using Xcode 7.2.1

May I know what's the reason and how to fix? Thanks