adding exercies for steps 2-1 and 2-2

step2-01/demo/src/interfaces/index.ts

@@ -0,0 +1,22 @@
+interface Car {
+  make: string;
+  model: string;
+}
+
+class MyCar implements Car {
+  make: 'Honda';
+  model: 'Accord';
+}
+
+const myCar: Car = {
+  make: 'Honda',
+  model: 'Accord'
+};
+
+// Interface as Functions
+interface InterestingFn {
+  (someArgs: string): number;
+}
+
+// adding an export to turn this into a "module"
+export default {};