[ADD] inventory: How to get credentials for UPS shipping integration?

https://docs.google.com/document/d/1fogqe6VKjixTWg5Pclbj8f69Kh1Q_dguvwwoyuXrAMU/edit?usp=sharing

inventory/shipping/setup.rst

@@ -7,4 +7,5 @@ Shipping Setup
    :glob:
 
    setup/delivery_method
-   setup/third_party_shipper
+   setup/third_party_shipper
+   setup/ups_credentials

inventory/shipping/setup/ups_credentials.rst

@@ -0,0 +1,83 @@
+=====================================================
+How to get UPS credentials for integration with Odoo?
+=====================================================
+
+Please note that only those customers that are based in the US can open
+a UPS account number online. If you are located in a country other than
+the US, you will need to contact Customer Service for your country
+location to open UPS account number.
+
+In order to use the UPS APIs from Odoo, you will need to have the items
+listed below:
+
+- UPS.com user ID and password
+
+- UPS account number
+
+- Access Key
+
+An Access Key is a 16 character alpha-numeric code that allows access to
+the UPS Developer Kit API Development and Production servers.
+
+Create an UPS Account
+=====================
+
+To register with MyUPS.com, please follow these steps:
+
+1. Access the UPS.com web site at
+`www.ups.com <http://www.ups.com/>`__, and click the **New User** link
+at the top of the page.
+
+2. Click the **Register for MyUPS** button, and follow the prompts to
+complete the registration process.
+
+To open an account with UPS and receive a UPS shipper number, please
+follow the steps below:
+
+`http://www.ups.com/content/de/en/contact/index.html?WT.svl=Footer <http://www.ups.com/content/de/en/contact/index.html?WT.svl=Footer>`__
+
+Once you have created a UPS.com user ID profile you will need to add
+your UPS account number to your UPS.com profile, please follow the steps
+below:
+
+1. Log in to the UPS.com site
+(`http://www.ups.com <http://www.ups.com/>`__) using your UPS.com User
+ID and Password.
+
+2. Click the **My UPS** tab.
+
+3. Click the **Account Summary** link.
+
+4. Click the **Add an Existing UPS Account** link in the **UPS Account Details**
+section of the page.
+
+5. In the **Add New Account** screen, enter the **UPS Account Number**, **Account
+Name**, and **Postal Code** fields. The country automatically defaults to
+United States. If desired, select the **Make this my default payment
+account** link to set the account as the default billing method for the
+profile.
+
+6. Click the **Next** button to continue.
+
+Get an Access Key
+=================
+
+After you have added your UPS account number to your user ID profile you
+can request an Access Key from UPS using the steps below:
+
+1. Log into UPS.com with your user ID and password.
+
+2. Go to the **UPS Developer Kit** web page
+`https://www.ups.com/upsdeveloperkit?loc=en\_US <https://www.ups.com/upsdeveloperkit?loc=en_US>`__
+
+3. Click on the link **Request an access key**.
+
+4. Verify the **Primary Contact Information**
+
+5. Enter the **Secondary Contact Information**
+
+6. Click the **Request Access Key** button.
+
+Once completed, the **Access Key** will be provided to you on the web page,
+and an email with the Access Key will be sent to the email address for
+the primary contact information.