Create README.md

Author: fubar-coder

README.md

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+# CSFtp - [A C# FTP Server](http://www.codeguru.com/csharp/csharp/cs_network/sockets/article.php/c7409/A-C-FTP-Server.htm)
+
+This is a modified version of the FTP server developed by David McClarnon.
+The original article and source can be found [here](http://www.codeguru.com/csharp/csharp/cs_network/sockets/article.php/c7409/A-C-FTP-Server.htm)
+
+# Changes of my version:
+
+* Dynamic PASV listener port
+* Made handler processing and sending async
+* Fixed PASV output to something that's understood by most FTP clients
+* Fixed blocking UI when connection is active
+* Fixed UI access from background thread