get listed on todotxt.com

[jpouellet]

This is a rather nice Todo.txt manager implementation.

It would be nice if it were listed on the bottom-left of http://todotxt.com/ so it'd be more discoverable and save people time trying other implementations.

FWIW I've used the Todo.txt format off and on for quite some time but only came across this just today via https://quassy.github.io/elementary-apps/