Document use of abo-abo/hydra

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 To avoid these issues, all timestamps added or used by org-fc are
 ISO8601 formatted (e.g. =2020-01-15T11:58:12=) using *UTC0* as the
 timezone.
+*** Use of [[https://github.com/abo-abo/hydra][hydra]]
+To keep this package as small as possible, [[https://github.com/abo-abo/hydra][abo-abo/hydra]] is used
+for showing statistics and hotkeys during review.
+
+The main benefit of this is that it saves us from writing a lot of
+(hard) window / split / buffer management code.
+
+As a consequence, if you want to add your own hotkeys to one of the
+hydras used by this package, you'll have to write a new one instead of
+being able to redefine keys / add keys in an existing one.
 ** Getting Started
 Before using this package, a few variables have to be set: