added a simple example

Former-commit-id: 1af510712a

examples/multi-objective/mdp/simple/simple.nm

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+// sum of two dice as the asynchronous parallel composition of
+// two copies of Knuth's model of a fair die using only fair coins
+
+mdp
+
+module simple
+
+	// local state
+	s : [0..2] init 0;
+
+	[A] s=0 -> 0.2 : (s'=1) + 0.8 : (s'=0);
+	[B] s=0 -> 1 : (s'=2);
+	[]  s>0 -> 1 : (s'=s);
+endmodule
+
+rewards "actA"
+	[A] true : 1;
+endrewards
+
+rewards "actB"
+	[B] true : 2;
+endrewards
+
+
+label "a" = s=1;
+label "b" = s=2;

examples/multi-objective/mdp/simple/simple.pctl

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+Pmax=? [ F "a" ] ;
+Pmax=? [ F "b" ] ;
+multi(P>0.4 [ F "a"], P>0.3 [ F "b"] )