Added new provider - Synthesia (#602)
Added new provider - Synthesia (#602)

* chor: Added new provider - Synthesia

* chor: Added new line

* chor: Added url, format

Co-authored-by: Matej Pesjak <84d8f9ccf54e77525da1c9eb1ed88c40195e003e@Matejs-MBP.domain_not_set.invalid>
iamcal/oembed,iamcal/oembed,iamcal/oembed,iamcal/oembed