Add BlackHole
Add BlackHole

Types of Changes
What types of changes does your PR introduce? Put an x in all boxes that apply

## Types of Changes
What types of changes does your PR introduce? Put an x in all boxes that apply
[x] New addition to list
[ ] Fixing bug in existing item in list
[ ] Removing item from list
[ ] Changing structure (organization) of list
[ ] Proposed Changes

## Reason to be adderd
BlackHole should be added because there is no freemium audio driver app in the awesome list yet.
xcv58/awesome-mac,jaywcjlove/awesome-mac