Update README.md
README.md -> index.html #convertor: www.ctrlshift.net/project/markdowneditor

I used CtrlShift's markdown editor to convert readme to html.
And now?
Changed js:script tag to custom tag foo

This is what OscarGodson said.
README.md -> index.html

js:script tag removed, using custom tag foo instead.
Merge pull request #9 from m93a/master

Added section 4 - Tag types