Add wagtail-personalisation (#45)

There isn't an obvious existing category for personalisation - perhaps we should create 'Customer Experience' and move this and wagtail-experiments into it?

README.md

@@ -142,6 +142,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 - [Wagtail Sharing](https://github.com/cfpb/wagtail-sharing) – Easier sharing of Wagtail drafts.
 - [Wagtail Postgres Search Backend](https://github.com/leukeleu/wagtail-pg-search-backend) - PostgreSQL full text search backend for Wagtail CMS.
 - [Wagtail Gridder](https://github.com/wharton/wagtailgridder) - Grid card layout similar to Google image search results, with an expanded area for card details.
+- [Wagtail Personalisation](https://github.com/LabD/wagtail-personalisation) - Personalisation module, enabling editors to create customised pages - or parts of pages - based on segments whose rules are configured directly in the admin interface.
 
 ## Tools