Add nominee: Open Food Facts

[dpgabot]

Automatic addition of a new nominee submitted through the online form available at https://digitalpublicgoods.net/submission

[nathanbaleeta]

@conradsp @jwflory looks good to me, ready for your review. Thanks.

[nathanbaleeta]

Digital solutions that are no longer active, or do not provide the required documentation needed for review, will be removed from the DPG Registry as per the archiving policy.