There now is a QOwnNotes package for Solus!
Please visit the QOwnNotes installation page for details on how to use it.
A big thank you to Joshua Strobl on ⚓ T1687 QOwnNotes for packaging QOwnNotes for the unstable repository of Solus.
Edit 2016-11-25: QOwnNotes is now in the Solus main repository.
(image by Solus Project)