Add a readme.

README.md

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+FrankerFaceZ
+============
+
+Copyright (c) 2015 FrankerFaceZ
+
+This script is free to modify for personal use. You are not allowed to sell or
+distribute FrankerFaceZ or any components of FrankerFaceZ.
+
+
+Developing
+==========
+
+FrankerFaceZ uses node.js to manage development dependencies and to run an HTTP
+server for development. To get everything you need:
+
+1. Install node.js
+2. Run ```npm install``` within the FrankerFaceZ directory.
+
+
+From there, you can use gulp to build the extension from source:
+
+```
+gulp
+```
+
+Gulp can also watch source files for modifications and rebuild it immediately:
+
+```
+gulp watch
+```
+
+
+To start the development server, run ```npm test```. The development server listens
+on port 8000.
+
+
+You will also need to use the version of the Chrome extension included in the
+repository. Remove any existing copy of FrankerFaceZ from your browser and load
+the unpacked extension in the ```Chrome Extension``` folder.
+
+Once you're using that extension, use the command ```/ffz debug``` in Twitch chat
+to enable debug mode, and then refresh the page. If the current version of FFZ
+does not support the debug command, then open the JavaScript console on twitch.tv
+and run:
+
+```
+localStorage.ffzDebugMode = true;
+```
+
+Refresh the page once debug mode is enabled to use the local version of the script.