add link to github.com/dwyl/learn-environment-variables for #10 #13

create-google-app-guide.md

@@ -74,10 +74,14 @@ the details of your App for the credentials.
 
 + Application Type: Web application
 + Name: Elixir Auth Server
-+ Authorized JavaScript origins: http://localhost:4000
-(_the default for a Phoenix app on your local dev machine_)
-+ Authorized redirect URIs:  http://localhost:4000/auth/google/callback
-(_the endpoint to redirect to once authentication is successful_)
++ Authorized JavaScript origins:
+http://localhost:4000
+(_the default for a Phoenix app on your local dev machine.
+  you can add your "production" URL later._)
++ Authorized redirect URIs:  
+http://localhost:4000/auth/google/callback
+(_the endpoint to redirect to once authentication is successful.
+  again, add your production URL once you have auth working on `localhost`_)
 
 > Ensure you hit the enter key after pasting/typing
 the URIs to ensure they are saved.
@@ -96,12 +100,6 @@ server and client implementations.
 For now just create the server (Elixir) credentials.
 
 
-<!--
-![elixir-auth-demo-enable-apis](https://user-images.githubusercontent.com/194400/69723299-24ef4c00-1111-11ea-8fb2-908c220d5d0c.png)
-
-Click the **+ ENABLE APIS AND SERVICES** button.
--->
-
 ## 5. Download the OAuth Client Credentials
 
 After you click the **Create** button
@@ -156,11 +154,22 @@ But this is what the file looks like.
 ## 6. Save the Credentials in your `.env` File
 
 Once you have the credentials for your OAuth Client,
-add them to your **`.env`** (_environment variables_) file.
+export them as **environment variables**
+so that your Elixir/Phoenix app can access them.
+
+> If you are new to environment variables,
+please see:
+[github.com/dwyl/learn-environment-variables](https://github.com/dwyl/learn-environment-variables)
+
+In our case we add the credentials
+to an **`.env`** (_environment variables_) file.
 
 e.g:
 
-```
+```yml
 export GOOGLE_CLIENT_ID=631770888008-6n0oruvsm16kbkqg6u76p5cv5kfkcekt.apps.googleusercontent.com
 export GOOGLE_CLIENT_SECRET=MHxv6-RGF5nheXnxh1b0LNDq
 ```
+
+Return to step 3 of the
+[README.md](https://github.com/dwyl/elixir-auth-google/blob/master/create-google-app-guide.md)