Update README.md

README.md

 # PSDBG -- Proof Script Debugger 
 
 ![logo](share/logo.png)
+
+The proof script debugger is a prototypical implementation of an interaction 
+concept for program verification systems that are rule based and use a program 
+logic. The prototype is implemented on top of the interactive program
+verification system KeY. 
+KeY is an interactive program verification system for Java program annotated with the Java Modeling Language (JML).
+
+The protypical implementation includes a proof scripting language that is 
+tailored to the problem domain of program verification. The main features of 
+the language are:
+
+* integration of domain specific entities like goal, formula, term and rule as first-class citizens into the language;
+* an expressive proof goal selection mechanism
+** to identify and select individual proof branches,
+** to easily switch between proof branches,
+** to select multiple branches for uniform treatment (multi-matching); that is resilient to small changes in the proof
+* a repetition construct which allows repeated application of proof strategies;
+* support for proof exploration within the language.
+
+Together with the proof scripting language a debugging concept for failed 
+proof attempts is implemented that leverages well-known concepts from program 
+debugging to the analysis of failed proof attempts.
+
+# About this Repository
+
+The latest build as jar file can be downloaded here. 
+Plese note that some funtionlities may not work in this jar as it is the build 
+of the development version of PSDBG.
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