Added README.md file.

README.md

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+Wlx2Explorer
+=============
+
+Wlx2Explorer is an application which allows to use Total Commander lister plugins from Windows Explorer.
+You open Windows Explorer, select the necessary file and press the hot keys, then you can use the plugin.
+
+Requirements
+------------------
+
+* OS Windows XP SP3 and later.
+* .NET Framework 4.0
+
+Files
+------------------
+
+* Wlx2Explorer.exe - The main executable module.
+* Wlx2Explorer.xml - The application settings file.
+* Wlx2Explorer.ini - The plugins settings file.
+
+How does it work?
+--------------------
+
+* When the application starts, it loads all plugins in the RAM.
+* Then it runs the local keyboard hook WH_KEYBOARD_LL.
+* When the user presses hot keys, the application detects the selected file in Windows Explorer, matches the file and the plugin, shows the plugin on the screen.
+* The user can add any number of plugins through dialogue "Settings...".
+* If the application has been configured to use several plugins for one type of the file, the user will see the first one from the list of plugins.