adding exercies for steps 2-1 and 2-2

step2-01/demo/src/index.tsx

@@ -0,0 +1,19 @@
+// Interesting Typescript Topics
+
+// types
+import './types';
+
+// interface
+import './interfaces';
+
+// modularity
+import './modules';
+
+// generics
+import './generics';
+
+// await / async
+import './async';
+
+// spread syntax
+import './spread';