add lila source example files

examples/syracuse.lila

@@ -0,0 +1,13 @@
+// Computes the syracuse sequence with the given inital term
+// until it reaches 1 (it probably will).
+fn syracuse(x0: int) int {
+	x = x0;
+	while x != 1 {
+		if x % 2 == 0 {
+			set x = x / 2;
+		} else {
+			set x = 3 * x + 1;
+		};
+	};
+	x
+}