Updated Git Ignore

Signed-off-by: Toby Herbert <tobyherbert@synappsdev.co.uk>
Added plugin.

Added the Extractor IO plugin to the repository.

Signed-off-by: Toby Herbert <tobyherbert@synappsdev.co.uk>
Updated README.md

Signed-off-by: Toby Herbert <tobyherbert@synappsdev.co.uk>