Moved test_sum into it's own directory under scripts/

scripts/test_sum/test_sum.toy

@@ -0,0 +1,17 @@
+//the test case (toy)
+fn test_sum(key: int, val: int) {
+	fn sum(n: int) {
+		if (n < 2) {
+			return n;
+		}
+
+		return n + sum(n - 1);
+	}
+
+	var result: int const = sum(val);
+	print string key + ": " + string result;
+}
+
+for (var i: int = 0; i <= 10; i++) {
+	test_sum(i, i * 1000);
+}