Keyboard shortcuts, after Feedly's

j/n and k/p step through the items, Shift-J and Shift-K through the feed
list, and g with a letter goes to a place: All Subscriptions, Directory,
Popular, Currently Listening, Settings. o plays the selected item, m marks
it read or unread and s keeps it, each by pressing the toolbar's own
button; v opens the original, Shift-A marks all read, r refreshes, [ hides
the feed list, and ? lists them all. None fire while typing, with a
modifier held, or with a dialog open.

Closes #8.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -12,6 +12,8 @@ The long form, with what was wrong before and how it was found, is in
 
 ### Added
 
+- Keyboard shortcuts after Feedly's: j and k through items, Shift-J and Shift-K through feeds,
+  g and a letter to go to a place, o to play, s to keep, and more. Press ? for the whole list.
 - Directory can be filtered to Podcasts or Blogs, and by each show's own iTunes category as a row
   of chips, the narrower one where a show gives two (Games, not Leisure). The two combine, and
   both filter in place.