Added N-Version programming pattern description + mapping to simple seim

model in examples.

examples/pseim.examples/n-version-programming/model_nverg.mapping

@@ -0,0 +1,12 @@
+transform test using nverG {
+	multiplicity 
+		nverG.nb_in -> 2
+	    nverG.nb_vin -> 6
+	    nverG.nb_out -> 2
+	    nverG.nb_comp -> 3
+	components 
+		test.comp -> nverG.top
+	ports
+		test.comp.sc1.i1, test.comp.sc1.i2 -> nverG.top.i
+		test.comp.sc1.o1, test.comp.sc1.o2 -> nverG.top.o
+}