Added brief project description.

README.md

@@ -1,6 +1,36 @@
 # GenericBreakGlass: XACML Reference Implementation 
+Today’s IT systems implement fine-grained access control mechanisms
+to protect a companies assets and to fulfill regulations such as
+Basel III, SoX or HIPAA . In general, access control cannot fully
+capture all requirementsIn particular, for exceptional situations it
+is hard to formulate access control policies taking all possible
+legitimate accesses into account.  Exceptional Access Control is an
+approach for allowing users to override access control decisions in,
+e.g., emergency situations. Different approaches and techniques
+have been presented how to allow the user to override access control
+restrictions in a controlled way, e. g., Break (the) Glass,
+Overriding Access Control, or related approaches such as Optimistic
+Security. 
+
+This project contains an XAML PDP/PEP infrastructure supporting 
+Break Glass Access control. 
 
 ## Team 
 Main developers:
 * [Achim D. Brucker](http://www.brucker.ch/)
 * [Helmut Petritsch](http://petritsch.co.at/)
+
+## License
+This project is licensed under the Apache License Version 2.0.
+
+## Publications
+The most important publications are:
+* Achim D. Brucker and Helmut Petritsch. Extending access control 
+  models with break-glass. In Proceedings of the 14th ACM symposium 
+  on Access control models and technologies (SACMAT '09). ACM, New 
+  York, NY, USA, 197-206. 2009. 
+  doi: [10.1145/1542207.1542239](http://dx.doi.org/10.1145/1542207.1542239)
+* Helmut Petritsch: Break-Glass - Handling Exceptional Situations in Access Control. 
+  Springer 2014, ISBN 978-3-658-07364-0, pp. 1-220
+  doi: [10.1007/978-3-658-07365-7](http://dx.doi.org/10.1007/978-3-658-07365-7)
+