add some install instructions

docs/INSTALL

-nothing here yet
+== PREREQUISITS ==
+php5
+currently mysql, should optionally be sqlite
+
+== SETUP ==
+Set up your paths in:
+config/config.php
+
+Your data will be in:
+$CONFIG_DATADIRECTORY = '/www/testy';
+
+And the ownCloud path is:
+$CONFIG_DOCUMENTROOT = '/www/owncloud/htdocs';
+
+Both are absolute paths, so if your server is in /var/www, you need to add the /var
+
+
+
+