Hello World add on using Routes 1.0.0

I usually code for functionality and then add in the UI, so this held me back for about 2 days. I can now go on from here myself.

This is an example add on to install that'll create a template demo_hello_world_index and route hello-world that can be accessed by your board by:

1. With Friendly URLs: https://yourforum.com/hello-world
2. Disabled: https://yourforum.com/index.php?hello-world

To get this:



Anyone who wants to audit the code to see if it's up to spec is welcome to (for myself and others) and post in the discussion what may be wrong with it.