Update and convert the README to markdown

Fix links and move everything to github.

README.md

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+irssi-xmpp
+==========
+
+**Homepage:** https://github.com/cdidier/irssi-xmpp
+
+
+## About ##
+
+irssi-xmpp is an irssi plugin to connect to the XMPP network (jabber).
+
+Its main features are:
+ * Sending and receiving messages in irssi's query windows
+ * A roster with contact & resource tracking (contact list)
+ * Contact management (add, remove, manage subscriptions)
+ * MUC (Multi-User Chat)
+ * Tab completion of commands, JIDs and resources
+ * Message Events ("composing")
+ * Support for multiple accounts
+ * Unicode support (UTF-8)
+ * StartTLS, SSL (deprecated) and HTTP proxy support
+ * ...
+
+To deal with the XMPP protocol, it uses of the Loudmouth library.
+Written in C and released under the GNU General Public License version 2.
+
+
+## Installation ##
+
+### Requirement ###
+ * Loudmouth (>= 1.4.x): https://github.com/mcabber/loudmouth
+ * Irssi (>= 0.8.13) and its sources unpacked and configured:
+      http://irssi.org/
+
+### Procedure ###
+ * edit the file **config.mk** if needed and export this environment variable:
+   ``` $ export IRSSI_INCLUDE=/path/to/irssi/sources ```
+ * build the sources:
+   ```$ make ```
+ * install the module:
+   *  in your home directory:
+     ``` $ make user-install ```
+   * in the base system:
+    ``` # make install ```
+
+
+## Documentation ##
+
+In the directory **docs/**:
+ * **STARTUP**: Getting started
+ * **GENERAL**: How to use irssi-xmpp and related commands
+ * **MUC**: How to use Multi-User Chat and related commands
+ * **FAQ**: Frequently Asked Questions and Troubleshooting
+ * **XEP**: XMPP Extensions supported
+ * **INTERNAL**: How irssi-xmpp works
+
+In the directory **help/** you can find the help files of each irssi-xmpp
+specific commands, which can be viewed in irssi with the command /HELP.
+
+
+## Bugs and suggestions ##
+
+ * On Github:	https://github.com/cdidier/irssi-xmpp/issues
+
+ * MUC room:	irssi-xmpp@chat.jabberfr.org
+
+If irssi crashes, please build irssi with debug symbols and the module
+irssi-xmpp in debug mode (take a look at **config.mk** to activate it).
+Then you can run irssi in gdb and print the backtrace ("bt full") when
+irssi crashes.  Paste the backtrace in your message would help to fix
+this bug.