Added opengraph place & product properties

[gtapps]

Hello guys,

Added the ability to add Product & Place properties according to:
https://developers.facebook.com/docs/reference/opengraph/object-type/product/
https://developers.facebook.com/docs/reference/opengraph/object-type/place/

Cheers,

[iohaneiro]

Hi, thanks for this amazing tool,

Could you add meta property missing for facebook requirements, please? according to microdata-tags for OpenGraph

https://developers.facebook.com/docs/marketing-api/catalog/guides/microdata-tags

missing tags are:

brand
availability
condition
retailer_item_id
item_group_id
category
product:plural_title

thanks a lot...

[J-Brk]

@isideastech Thank you for reaching out. It seems there are indeed some attributes missing. For the time being, you should be able to easily use them with addValue. I have opened a new issue regarding the missing attributes #297.