[Meta] List of declared Member Platform 1.0 early adopters

Asheville is interested.

We are working on the #la_eu project, which is a website for local Drupal Associations. We want to use the Membership platform and hopefully connect to it with the websites for the local associations.
This initiative is also eagerly followed by the Network of European Drupal Associations.

added
Drupal Austria Association - Grienauer (when working together with #la_eu system)

Updated issue summary to make the purpose/scope more clear, more simply describe all potential early adopters as "interested" rather than "declared" / "undeclared", and add URLs to existing early adopters' sites.