Update README with credits

Author: robertcollier4

README.md

@@ -4,3 +4,9 @@ AutoItScript - Syntax Package for Sublime Text 2/3
 AutoItScript AU3 language package for SublimeText including syntax highlighting, comments toggling, snippets, and build system.
 
 For the build system, you will need to set your specific path to AutoIt3.exe in the file AutoIt.sublime-settings (you can open this file via the Menu Preferences>Package Settings>AutoIt Settings).
+
+Credits
+------------
+Syntax rules: http://sublime-text-community-packages.googlecode.com/svn/pages/AutoIt.html
+
+Snippets: http://www.autoitscript.com/forum/topic/148016-sublimetext/page-3#entry1080276