Add todo.txt mime type
Adds mime type for the todo.txt file spec defined in https://github.com/todotxt/todo.txt
Relevant discussion about this format: https://gitlab.gnome.org/GNOME/gtksourceview/-/merge_requests/315#note_1694100
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Adds mime type for the todo.txt file spec defined in https://github.com/todotxt/todo.txt
Relevant discussion about this format: https://gitlab.gnome.org/GNOME/gtksourceview/-/merge_requests/315#note_1694100