Add netrw mappings in simplenote list window

[kiryph]

I am familiar with many netrw mappings when I view a directory listing. For a complete list of mappings see :h netrw-quickmap.

I think quite a few mappings could also be used in a simplenote list window:

• % create new note
• D delete note
• R rename note
• s select sorting style: name, creation date, mod date
• r reverse sorting
• mf/mF/mu to mark/pin or unmark/unpin a note

[atomicules]

Not something I plan on working on, but I'll leave this open as an idea if someone did want to provide this functionality.