Put a category into each VTODO

[dpocock]

iCalendar supports category strings.

We could just use a constant such as 'Github' as the category for all issues

We could also use each repository name as a category name

[ghost]

The changes should be made to main.py, right ?

[ninjatrench]

Patch created for this. user need to add addcategory: True or Title or addcategory: SomethingElse in config file, if its just kept as true, then repo title will be category, if something else, then that string will go as Category. Kindly have a look at pull request.

Thank you