Update the project page message about OAuth support

Create an API access credential at https://developer.ups.com/

1. Login to your UPS account
2. Click "My Apps"
3. Click "Add Apps"
4. I need API credentials because: I want to integrate UPS technology into my business
5. Choose an account to associate with these credentials
6. Click the checkbox to agree to the terms then click Next
7. Enter contact details and click Next
8. Enter the App name
9. Leave Callback URL empty
10. In the Add Products section find "Rating" and click the + button to add it.
11. Click Save

Enter credentials in shipping method

• Billing Account number -> Account number
• Client ID
• Client Secret