README: Add more Markdown, add link to docs

Author: mhaas

NEWS

@@ -26,6 +26,7 @@ WiFiDog 1.2.0:
 	* Upgrade libhttpd to 1.4 (#91)
 	* Remove incomplete and broken BSD support (#93)
 	* Update doc/README.developers.txt (#113)
+	* Update README (-> README.md) (#114)
 	* Various other fixes and minor improvements, see
 		https://github.com/wifidog/wifidog-gateway/compare/1.1.5...1.2.0
 

README.md

@@ -4,11 +4,10 @@ The WiFi Guard Dog project is a complete and embeddable captive portal
 solution for wireless community groups or individuals who wish to open a
 free hotspot while still preventing abuse of their Internet connection.
 
-The project's homepage is:
-	http://dev.wifidog.org/
+More information and the old issue tracker can be found on
+[dev.wifidog.org][homepage].
+Nowadays, development happens on [github][GitHub].
 
-Development happens on GitHub:
-	https://github.com/wifidog/
 
 ## WifiDog Gateway ##
 
@@ -22,8 +21,18 @@ embedded hardware, e.g. the hotspot itself. The client is responsible for
 redirecting the user to the auth server where they may authenticate
 themselves. Depending on the response of the auth server, the client
 lifts the access restrictions for the user.
+Client and server speak the [WifiDog Protocol Version 1][protov1],
+with Version 2 being a draft which has not been implemented so far.
+A detailed description of the login process involving user,
+client and server is available as a [flow diagram][flowdia].
+
 
 ## License ##
 The project's software is released under the GPL license and is copyrighted
 by its respective owners. See COPYING for details.
 
+[homepage]: http://dev.wifidog.org/
+[github]: https://github.com/wifidog/
+[protov1]: http://dev.wifidog.org/wiki/doc/developer/WiFiDogProtocol_V1
+[flowdia]: http://dev.wifidog.org/wiki/doc/developer/FlowDiagram
+