hi jey
here is your sample XML file for template. This XML file is more important to install a template in joomla

<?xml version="1.0" encoding="iso-8859-1"?>
<mosinstall type="template" version="4.5.2">
<name>Template name</name>
<creationDate>11/2007</creationDate>
<author>test.com</author>
<copyright>This template is released under GNU/GPL License.</copyright>
<authorEmail>templates@test.com</authorEmail>
<authorUrl>www.test.com</authorUrl>
<version>1.0</version>
<description>
The template is a testing template.
</description>
<files>
<filename>index.php</filename>
</files>
<images>
<filename>images/img_header.gif</filename>
</images>
<css>
<filename>css/style.css</filename>
</css>
</mosinstall>

Regards
Falcon