Create admin interface to already exiting PHP website

We've got a PHP website that our customer wants to modify himself. Therefore, we need to create a simple admin panel with a login page. The admin panel has two tabs: ----- Tab #1: CONTENT This page lists every page on the website. If you click on a page's title, you can edit it. You can edit: FRENCH - title - content (in a JCE editor) - meta description - meta value ENGLISH - title - content - meta description - meta value Other fields for each page that cannot be modified is: ID, creation date, last modified. Tab #2: SITEMAP Generation When you hit "generate", it will generate an XML sitemap and will output the full URL of the sitemap. ----- Once we finish the admin panel, we will need to create some CSS to add style to it. The design will be simple but don't worry if it's too complicated we will adjust the price, no problem. We don't have the admin design now. Also, for every page, we'll need to create rewrite rules in order to create clean URLs. I will give the website's URL to interesting bids only. Thanks !