Add test code

test/functions.w12

@@ -0,0 +1,32 @@
+fn mult3(a: int, b: int, c: int) -> int {
+	return a * b * c;
+}
+
+fn loop_test() -> int {
+	var i: int = 0;
+	var result: int = 0;
+
+	while i < 10 {
+		printf("i = %d\n", i);
+		result += i;
+		i += 1;
+	}
+
+	return result;
+}
+
+fn main() -> int {
+	var a: int = 5;
+	var b: int = 3;
+	var c: int = 2;
+
+	var result: int = mult3(a, b, c);
+	printf("Result: %d\n", result);
+
+	result = loop_test();
+	printf("Result: %d\n", result);
+
+	return 0;
+}
+
+