add Meetup RVSP integration

[annamorgiel]

user should be able to RVSP and edit the RVSP to event, for example by launching the Meetup app

[AniketSK]

Looks like we'd need to let people login to meetup within the app to allow directly RSVPing from it.
Should the login for this be where the RSVP button would be the first time they click it?
Do you think it might mislead people into thinking they haven't rsvpd?

[annamorgiel]

Login wall after clicking on the RVSP button seems the most intuitive, a dialog could be displayed afterwards with a message about the current RVSPs status. The button could change to RVSP: yes or to RVSP: no.

Thanks for your question, welcome to the project and sorry for the delayed response, I didn't expect finding contributors so quickly 🌷I plan to release the app soon but I think this should go to the next release so I took the high prior's label down.