Create README.md

Author: Jonty

README.md

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+# Pub Standards London RSVP System
+
+We automatically create a Github Issue here for every upcoming [Pub Standards](https://london.pubstandards.com/) event, reacting to it indicates if you're attending, interested, or not attending.
+
+Reactions are displayed on [the main website](https://london.pubstandards.com/) within an hour.
+
+**[File your RSVP for the next PS event!](https://github.com/pubstandards/pubstandards-london-rsvp/issues)**
+
+If you'd like to be notified of upcoming events, watch this repository.