Update README.md

added php5-gd

README.md

@@ -10,7 +10,7 @@ Web control panel
 
 To install the web control panel, proceed as follow (on a debian install)
 
-    aptitude install apache2-mpm-prefork libapache2-mod-php5 php5-mysql mysql-server php5-mcrypt prosody pwgen
+    aptitude install apache2-mpm-prefork libapache2-mod-php5 php5-mysql mysql-server php5-gd php5-mcrypt prosody pwgen
     
 * Create an account and a database on the mysql server, insert the dump.sql file into that database
 * Edit the configuration file my/config.sample.php and rename it to my/config.php