Update README.md

credshelper/README.md

@@ -1,19 +1,21 @@
 # Helper app to build a test_credentials.json for running tests locally
 
+## First time
 In the current directory
-
 ```sh
 $ npm i
-$ npm start
-
 ```
-Make sure CORS policy is disabled (*) in you browser if you want test_credentials.json to include identity data needed by Android tests.
-
-In a browser, open `http://localhost:8080`, enter credentials.
-
-Copy the test credentials to your `test_credentials.json` file!
 
+## Running server
+In the current directory
+```sh
+$ npm start
+```
 
-(*) On chrome install https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi or run chrome --disable-web-security
+## Getting json for your test_credentials.json file
+In a browser, open `http://localhost:8080`, pick your login host and click `Start Login Flow` button.
+In popup, enter credentials.
+After the approval screen, the popup should close and the main window will show you the json for your `test_credentials.json` file.
 
+NB: the `test_credentials.json` file on Android contains additional fields. To get those additional fields, a call to the identity URL is made. This will only work if your browser has CORS policy disabled. To disable CORS, simply run chrome with the `--disable-web-security` flag.