Creating the database class
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Highlights:
- Adding all the database constants in a config file
- Including function.php to add some useful quick functions
- Creating the Databse object (class Database)
- Adding default stylesheet

Files:
- new file:   includes/config.php
- new file:   includes/database.php
- new file:   includes/functions.php
- new file:   public/index.php
- new file:   public/stylesheets/main.css