Update README

README.md

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-# colouring-london
+# Colouring London
-Collecting data on London's buildings - public beta at http://beta.colouring.london/
+
+How many buildings are there in London? What are their characteristics? Where
+are they located and how do they contribute to the city? How adaptable are
+they? How long will they last, and what are the environmental and
+socio-economic implications of demolition?
+
+[Colouring London](http://colouring.london/) is a web-based citizen social
+science project designed to help address these questions by crowdsourcing and
+visualising twelve categories of information on London’s buildings.
+
+## Structure
+
+This repository will contain open-source code for the project which:
+- stores building footprint polygons and source metadata
+- allows site users to record building attribute data
+- serves map tiles rendered from collected data
+- allows site visitors to download the collected building attribute data
+
+Building attribute data collected as part of the project will be made available
+for download under a liberal open data license (likely ODbL).
+
+## A note from our sponsors
+
+Colouring London is being designed and built by the Centre for Advanced Spatial
+Analysis (CASA), University College London and funded by Historic England.
+Ordnance Survey is providing building footprints required to collect the data,
+facilitated by the GLA, and giving access to its API and technical support.