update script

Author: zhiyuanliang-ms

examples/express-app/README.md

@@ -8,6 +8,12 @@ The examples are compatible with [LTS versions of Node.js](https://github.com/no
 
 ## Setup & Run
 
+1. Build:
+
+    ```bash
+    npm run build
+    ```
+
 1. Install the dependencies using `npm`:
 
     ```bash

examples/express-app/package.json

@@ -1,6 +1,7 @@
 {
     "scripts": {
-        "start": "node server.mjs"
+        "start": "node server.mjs",
+        "build": "cd ../../src/feature-management && npm i && npm run build && cd ../../examples/express-app && npm i"
     },
     "dependencies": {
         "@microsoft/feature-management": "../../src/feature-management",