Add README details on getting GDrive working locally.

README.md

@@ -83,6 +83,13 @@ At https://console.developers.google.com/project, make a project, then:
 
   Again, you should use `http://localhost:5000` as the referer for development.
 
+
+- Add the Google Drive API to your project and include the Google Drive API
+  Scopes in your OAuth consent screen.
+
+- For Google accounts to work locally, you'll also need to run a local Redis instance
+  and put its connection url into the `REDISCLOUD_URL` variable in `.env `
+
 ## Testing with Selenium
 
 There are tests in `test-util/` and `test/` that use Selenium to script a