More Admin "Add" functionality

Created add.php , checkinput.php and addForms.php to capture all the
logic for adding new records to the DB. Still missing validation.
General functionality works as expected. Attempted to use the Dropbox
API for storing images, but ran into issues: for now, stores images on
the hosting server.
Merge branch 'master' of https://github.com/Kluchy/SaborLatino

Conflicts:
	Logic/admin.php