add README

Author: jhuleatt

Node/quickstarts/genkit-helloworld/README.md

@@ -1 +1,33 @@
-TODO
+Genkit quickstart
+================================================
+
+This quickstart demonstrates how to initialize a [Genkit flow](https://firebase.google.com/docs/genkit/flows) and serve it with Cloud Functions for Firebase.
+
+[Read more about Cloud Functions for Firebase](https://firebase.google.com/docs/functions/)
+
+
+Getting Started
+---------------
+
+1. Install dependencies with `npm install`
+1. Start the functions emulator with `firebase emulators:start --only functions`
+    1. The emulator will output the function URL. It is usually of the form:
+
+    ```
+    https://127.0.0.1:5001/{$PROJECT}/us-central1/tellJoke
+    ```
+
+1. Call the function from a terminal, replacing the `url` argument with your function's URL:
+
+    ```bash
+    $ curl -X POST \
+        --url https://127.0.0.1:5001/{$PROJECT}/us-central1/tellJoke \
+        --header "Content-Type: application/json" \
+        --header "Accept: text/event-stream" \
+        --data '{"data": "Observational comedy"}'
+    ```
+
+License
+-------
+
+© Google, 2025. Licensed under an [Apache-2](../../../LICENSE) license.