Add benchmark info to readme

Former-commit-id: 41a49d17fb [formerly 4fc35283a4]
Former-commit-id: 212fe1bbc8

README.md

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+Storm 
+==============================
+
 For more instructions, check out the documentation found in [Getting Started](doc/getting-started.md)
+
+
+Benchmarks
+----------------------------
+
+Some examples can be found in the example folder:
+Further example input files for storm can be found in the following repositories:
+
+* Prism files (DTMC, MDP, CTMC): 
+http://www.prismmodelchecker.org/benchmarks/
+* Jani files (DTMC, MDP, CTMC, MA):
+http://jani-spec.org/
+* MRMC style tra files:
+(private, contact: dehnert@cs.rwth-aachen.d)
+* GSPNs:
+(private, contact: sebastian.junges@cs.rwth-aachen.de)
+* DFTs:
+https://github.com/moves-rwth/dft-examples
+* PGCL:
+(private, contact: sebastian.junges@cs.rwth-aachen.de)