LICENSE file added

LICENSE

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+Font License
+Applies to all desktop and webfont files in the following directory: `font-awesome/fonts/`.
+License: SIL OFL 1.1
+URL: http://scripts.sil.org/OFL
+
+---
+
+Code License
+Applies to all CSS and LESS files in the following directories: `font-awesome/css/`, `font-awesome/less/`, and `font-awesome/scss/`.
+License: MIT License
+URL: http://opensource.org/licenses/mit-license.html
+
+---
+
+Documentation License
+Applies to all Font Awesome project files that are not a part of the Font or Code licenses.
+License: CC BY 3.0
+URL: http://creativecommons.org/licenses/by/3.0/
+
+---
+
+Brand Icons
+- All brand icons are trademarks of their respective owners.
+- The use of these trademarks does not indicate endorsement of the trademark holder by Font Awesome, nor vice versa.
+- Brand icons should only be used to represent the company or product to which they refer.