PHP files for server-side storage of todo tasks

@erikthedeveloper, @laklein, @TheValencian 

Here are the PHP files as promised. There were a couple of weird things I had to do to get it all working, but we won't worry about those for now. Feel free to comment away!
Capilization? :monkey: Should be `getId()`, yes? getter for public property? Sorry. On mobile lol