Add DB connection layer

Include all the files needed for getting, inserting
or updating resources.
Add JS files

Include the JS files in charge of controlling all
the front-end logic.
Add CSS files
Add IMGs

Include all the imgs used in the different app's
views
Add syntaxhighlighter

As the commit's title indicates, we add the
syntaxhighlighter project for representing code.
Add dynamic front-page's elements

Including index.php, howto.php and operators.php
pages. Plus favicon.ico and robots.txt.
Add Netbeans config files