update documentation

docs/administration/installation.md

@@ -27,4 +27,44 @@ By default, MAMP uses port 8888 for Apache and port 8889 for MySQL. It is conven
 
 You will find the source of GenIE-Sys in your download folder. So you just need to Copy GenIE-Sys folder into corresponding ```~/Applications/MAMP/htdocs/``` folder.
 
-That is basically what you need to do in order to install GenIE-Sys on your Mac's local server. You should now be able to access it at: ```http://localhost/geniesys``` in your browser. Now you can see the essential website up and running. However to configure it correctly please update the configuration file as described in the next section.
+That is basically what you need to do in order to install GenIE-Sys on your Mac's local server. You should now be able to access it at: ```http://localhost:[port number if it is not 80]/geniesys``` in your browser. Now you can see the essential website up and running. However to configure it correctly please update the configuration file as described in the next section.
+
+
+## Configuration file
+
+We should update the settings file(```geniesys/plugins/settings.php```) right after the installtion. Especially the base URL depending on your webhost. For example:
+
+```php
+/*Define your base url with trailing slash*/
+$GLOBALS["base_url"]='http://localhost:[port number if it is not 80]/geniesys/';
+
+OR
+
+$GLOBALS["base_url"]='http://localhost:[port number if it is not 80]';
+
+```
+
+Next, we need to create a MySQL database and load our data.
+
+
+
+## Updates
+
+**Manual updates**
+
+GenIE-Sys can be updated manually using latest ZIP file from [GitHub](https://github.com/irusri/geniesys/archive/master.zip). Please backup your older version of  ```geniesys/plugins/settings.php``` and ```geniesys/genie_files``` before you do the latest update. First unzip the genie.zip file from your download folder and move into the Web Server server. Finally copy the ```geniesys/plugins/settings.php``` and ```geniesys/genie_files``` into latest version of GenIE-Sys.
+
+**Updates using Git**
+
+Here is the easy way to update GenIE-Sys using git submodules:
+
+```
+cd geniesys
+git checkout master
+git pull
+git submodule foreach --recursive git checkout master
+git submodule foreach --recursive git pull
+```
+
+
+