Explain settings in README

[ZYinMD]

Love the extension! Using it at least once per minute!

It'd be helpful to explain in README what these options mean:

Finder: Include End Char in Selection Finder: Jump to Line Endings Finder: Only Initial Letter Finder: Skip Selection

[lucax88x]

Thanks you very much for your words! You can submit a PR if you wish! :)

[ZYinMD]

lol sorry I'm unable to make a PR because I actually have no idea what they mean...