[Feature] Add keyboard & mouse shortcut list to user docs or app

[j-o-e-s]

Is your feature request related to a problem? Please describe.
Is it possible to add a full list of keyboard shortcuts to the user documentation and/or the app? Its been difficult to hunt down what can be done just by hovering over icons in the app. Also, the double-click chapter to open its downloaded folder is not documented, or I haven't found it.

Describe the solution you'd like
An entry in the user documentation with all keyboard shortcuts and mouse clicks. Or, a pop-up window with all this listed.

Describe alternatives you've considered
Writing it all down myself from various forums and user comments.

Context (please complete the following information):

• Your current HakuNeko Version 6.1.7

[Sheepux]

Won't be done in haku, but i'll do something in haru

[MikeZeDev]

Should i close it them?

[Sheepux]

No, haru will probably be merged back to haku once it's stable. Such Issue will still be open and must stay here.
That's why i'm not closing them myself when I comment
this is why they're all referenced here: manga-download/haruneko#40