Documentation: Add infos on how to check cookie settings via TypoScript

[christophrunkel]

It is easy to check via typoScript if a certain cookie is set.

[ request.getCookieParams()['cookie_consent'] matches '/youtube/' ]
#[ 'youtube' in traverse(request.getCookieParams(), 'cookie_consent.options') ]
lib.contentElement.settings.media.dsgvoEnabled = 1
[END]

Would maybe be useful for other users, if this snipped appears in the configuration.

By the way; GREAT WORK.