modify demo

apps/simple/csv.ts

-import { PapaCSVReader } from "../../packages/core/src/readers/CSVReader";
-import { VectorStoreIndex } from "llamaindex";
+import { VectorStoreIndex, PapaCSVReader } from "llamaindex";
 
 async function main() {
   // Load CSV

packages/core/src/index.ts

@@ -22,6 +22,7 @@ export * from "./callbacks/CallbackManager";
 
 export * from "./readers/base";
 export * from "./readers/PDFReader";
+export * from "./readers/CSVReader";
 export * from "./readers/SimpleDirectoryReader";
 
 export * from "./storage";