Update README.md

Make it more clear you need to log in with Google OAuth to generate the first user before you can run the seed script.

Author: canjalal

README.md

@@ -58,9 +58,10 @@ There are two ways to run Compass locally:
    NOTE: If you get into a login loop, double check that the Docker services are running
 
 4. Seed database (Optional)
+
+   This runs the seed script with test data. You will first need to log in to Compass with Google OAuth to create the first user. Then, run the following:
    ```sh
    npm run db:seed           # Seed the database with test data
-                             # Must be done after login to Compass app
    ```
 
 **Option 2: Run both server and supporting services locally**