Update README.md

Author: DanTup

README.md

@@ -2,4 +2,19 @@ A sample Flutter web project for using on GitHub Codespaces.
 
 In order to use debugging, you'll need to use Chrome with the [Dart Debug extension](https://chrome.google.com/webstore/detail/dart-debug-extension/eljbmlghnomdjgdjmbdekegdkbabckhm?hl=en) installed.
 
-- TODO: instructions
+// TODO(dantup): This does not work because of proxy/authentication issues:
+
+Access to fetch at 'https://improved-garbanzo-abcdefghijkl-40019.app.github.dev/$dwdsExtensionAuthentication' from origin 'chrome-extension://eljbmlghnomdjgdjmbdekegdkbabckhm' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
+
+- Fork this repo
+- Open your fork on github.com
+- Click the green "Code" button and then "Create Codespace"
+- Wait for the Codespace to be created and open the VS Code web editor
+- When prompted, click "Run pub get"
+- Ensure the "Web Server" is selected in the status bar
+- Press `F5` to start launching the app
+- If you see "Popup Blocked" in the Chrome address bar, click the notification then on the link to open the page manually
+- Click on the Dart Debug Extension icon
+- Wait for the "Autentication Success" page, then close that tab
+- Reload the app page (?)
+- Click on the Dart Debug Extension icon again