Created Customize Font Awesome (markdown)

Customize-Font-Awesome.md

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+# New Icons
+
+Font Awesome receives dozens of new requests each day. Some of them will eventually be included, others will not. [Popularity](https://github.com/FortAwesome/Font-Awesome/issues?q=is%3Aopen+is%3Aissue+label%3A%22new+icon%22+sort%3Acomments-desc) is one of the factors taken into account, but it is not the only one.
+
+So, if you need a new icon in a short while, our suggestion is to customize Font Awesome.
+
+## The Easy Way
+
+There are some wonderful online services which allows you to customize Font Awesome, like:
+
+- Fonticons: https://fonticons.com/ (by @davegandy)
+- Fontello: http://fontello.com/
+- IcoMoon: http://icomoon.io/app/#/select
+- Fontastic: http://fontastic.me/
+
+Pick up the one which better fits your needs.
+
+## The Hard Way
+
+*Note that you may need commercial software*
+
+1. [Fork](https://github.com/FortAwesome/Font-Awesome/fork) the repository. You need a properly configured development environment
+2. Hack with the `.otf` file. Here it is a guide you can follow: [The making of Octicons](https://github.com/blog/1135-the-making-of-octicons)
+3. Share with the Font Awesome community. Check for [open issues](https://github.com/FortAwesome/Font-Awesome/issues) that are related to your fork and share your repository
+
+# New styles
+
+If you don't need new icons but have special needs for your stylesheet, please consider a custom build based on `.less` or `.scss` versions.