Added docs on how to add dynamic config options

doc/Developing/Dynamic-Config.md

@@ -0,0 +1,48 @@
+# Adding new config options to WebUI
+
+Adding support for users to update a new config option via the WebUI is now a lot easier for general options. This 
+document shows you how to add a new config option and even section to the WebUI.
+
+#### Update DB
+
+Firstly you will need to add the config option to the database. Here's an example:
+
+```sql
+insert into config (config_name,config_value,config_default,config_descr,config_group,config_group_order,config_sub_group,config_sub_group_order,config_hidden,config_disabled) values ('alert.tolerance_window','','','Tolerance window in seconds','alerting',0,'general',0,'0','0');
+```
+
+This will determine the default config option for `$config['alert']['tolerance_window']`.
+
+#### Update WebUI
+
+If the sub-section you want to add the new config option already exists then update the relevant file within 
+`html/pages/settings/` otherwise you will need to create the new sub-section page. Here's an example of this:
+
+```php
+<?php
+
+$no_refresh = true;
+
+$config_groups = get_config_by_group('alerting');
+
+$mail_conf = array(
+    array('name'               => 'alert.tolerance_window',
+          'descr'              => 'Tolerance window for cron',
+          'type'               => 'text',
+    ),
+);
+
+echo '
+<div class="panel-group" id="accordion">
+    <form class="form-horizontal" role="form" action="" method="post">
+';
+
+echo generate_dynamic_config_panel('Email transport',true,$config_groups,$mail_conf,'mail');
+
+echo '
+    </form>
+</div>
+';
+```
+
+And that should be it!