feat: adding typed-arrays example

Author: dheysonalves

lesson2/typed-arrays.ts

@@ -0,0 +1,9 @@
+let carMakers: string[];
+const dates = [new Date(), new Date()];
+const carsByMake = [["f15"], ["corolla"]];
+
+// Flexible types
+const importantDates = [new Date(), "2030-10-10"];
+const importantValues: (Date | string)[] = [];
+
+importantValues.push("2031-10-01");