Change readme to markdown

Author: Toby Zerner

README.html

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+esoTalk is free, open-source Internet forum software written in PHP and MySQL. It is intent on being extremely simple, fast, and modern, containing all of the essential features a forum might need, and a powerful plugin system allowing developers to extend it in any way they like.
+
+If you like this software, please consider [donating to support the developer](http://esotalk.org/donate).
+
+### Installing esoTalk
+
+1. Upload the contents of this folder to the location on your web server where you would like esoTalk to be accessible at.
+2. Visit this location in your web browser. You will be taken to the esoTalk installer.
+3. Follow the instructions in the installer. If you need help, visit the [esoTalk Support Forum](http://esotalk.org/forum).