Update doc

README.md

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 *Gisaf* is a web based GIS (Geographical Information System) initially developed
 for the CSR Goematics unit in Auroville, India.
 
+Its main audiences are local administrations which need a platform
+to develop and maintain a geographical, topological and environmental data,
+allow teams of surveyors to upload data and update the GIS in near real time,
+and collect data from a wide range of sources.
+
+Although it just works out of the box, it is primarily intended to be customized
+and extended with the data, uses, needs.
+
 ## Features
 
 - Layers defined with Python plugins or ANSI-standard categories
+- Open source industry standard interfaces (PostGIS database, OGCAPI)
 - Support of different geographical projections
 - Integrated administration interface
 - Export of data from standard formats (Geopackage, Shapefile)
 - Import and update of data managed in a well defined workflow with "baskets"
+- Acquisition of different kinds of surveyors' equipments, accuracies
+- Robust mechanisms of identification of the data sources, survey times
+- Geographical feature statuses (eg. Existing, Deprecated, Future)
 - Role-based access to data
 - Support temporal and other data for different features
+- Easy integration with IoT sensors, eg. using the MQTT protocol
 - Detailed information for all features
 - Tagging of features
 - Customizable, user triggered actions
 - Background map
 - Customizable base maps (domain specific set of layers)
 - Plugin architecture: add functions with Python packages
+- Free and open source
 
 ## Software stack
 
@@ -31,3 +45,12 @@ for the CSR Goematics unit in Auroville, India.
 ## Installation / deployment
 
 See the documentation in the deployment directory.
+
+## Configuration
+
+Documentation is being rewritten. Please contact us.
+
+## Demo
+
+A very basic demo without any data, basically to give a feel of the user interface,
+is available [here](https://gisaf.pholmi.ydns.eu).