Add Quickstart section to BB Manual

Would probably be helpful to many to copy over some of the content from the BB Quickstart Guide to the BB Manual.

I tried to see what the manual said about the operation of the main footswitch and couldn’t find this in one easy to read nugget.

Something like the image of the BB with the callouts on the pedal.

First tap: Start beat (with optional intro fill)
Tap once: Insert fill (different fill each time)
Hold down: Begin transition
Release: End transition, advance to next song part
Double tap: End song (with optional outro fill)
When no song is playing: Hold down to enter
tap tempo mode

IMHO it’s important that the main manual includes pretty much everything that quickstart covers. YMMV.