add support for newgrounds

[ihatespawn]

service name & description

newgrounds is a website that hosts user-generated content, including games, animation, art, and audio. it is known for its creative community and as a platform for independent creators to showcase their work.

link samples for the service you'd like cobalt to support

https://www.newgrounds.com/portal/view/938050 https://www.newgrounds.com/portal/view/937296 https://www.newgrounds.com/portal/view/841868

https://www.newgrounds.com/audio/listen/500476 https://www.newgrounds.com/audio/listen/1333544 https://www.newgrounds.com/audio/listen/1343889

https://www.newgrounds.com/art/view/ennuikal/extra-terrestrial https://www.newgrounds.com/art/view/azjackdavoid/pretty-hate-machine https://www.newgrounds.com/art/view/captionpanic/robert-cop https://www.newgrounds.com/art/view/nijaliz/soul