add CTRL F to search writen text

[demhauke]

Please submit only one feature request in one issue!
If it is UI/UX related, don't post how a single aspect of the UI should be changed, rather in which use-case you felt
the UI is lacking or should be improved.

if CTRL F is pressed you can enter a promt, that is searched on every text that is writen on the page.
like the CTRL F feature on browser or other text apps, if the promt is found it would be marked and the view could also jump there so that it is centreliced on the screen.

Describe the solution you'd like
if CTRL F is pressed a small text window opens on the right top of the screen, if the promt is found it would be marked and the view could also jump there so that it is centreliced on the screen.