Attempt to improve README.md

[SpotlightKid]

• Spelling fixes
• Grammar fixes
• Consistent capitalization (headings and text)
• Some re-wording and sentence restructuring for better readability, clarity and style
• Some added/changed Markdown formatting
  • Keyboard shortcuts table
  • Install commands as pre-formatted shell session sections
  • Various minor changes, such as use of backticks.
• Moved section "Build with localization support" under the previous section

[SpotlightKid]

I wasn't sure what the following sentence in the looper means:

Absolute time is not bound to the loop point, so you could record loops crossing it.

If recording stops at the loop point, how can you record loops crossing it?

[brummer10]

Many thanks, Christopher

If recording stops at the loop point, how can you record loops crossing it?

It doesn't. Recording stops, for the 2, recorded and all following loops, when the absolute time expire. Means, when you start recording the second loop in the middle of the first loop, it will stop recording not when the first loop returns, but when the absolute recording time of the first loop match the absolute recording time of the second one, which will then properly been somewhere in the middle of the first loop.