Add 3.15.6 example app (for compilation tests)

exampleApp/src/sncExample.stt

@@ -0,0 +1,22 @@
+program sncExample
+double v;
+assign v to "{user}:aiExample";
+monitor v;
+
+ss ss1 {
+    state init {
+	when (delay(10)) {
+	    printf("sncExample: Startup delay over\n");
+	} state low
+    }
+    state low {
+	when (v > 5.0) {
+	    printf("sncExample: Changing to high\n");
+	} state high
+    }
+    state high {
+	when (v <= 5.0) {
+	    printf("sncExample: Changing to low\n");
+	} state low
+    }
+}