Added guidance on license plates (#69)

Co-authored-by: Adin Ermie <[email protected]>

docs/welcome/support.md

@@ -2,6 +2,32 @@
 
 Last updated: **{{ git_revision_date_localized }}**
 
+## Project Set License Plate
+
+When requesting support, please provide the 6-character alphanumeric Project Set **license plate**. This is a unique identifier for your Project Set that helps us provide support more efficiently.
+
+### AWS
+
+To find the license plate for an AWS Project Set, follow these steps:
+
+1. Log in to the [AWS Management Console](https://aws.amazon.com/console/).
+2. The alphanumeric code in the **Account** column is the license plate for your Project Set.
+
+![AWS Project Set License Plate](../images/support/project-set-license-plate-example-aws.png "AWS Project Set License Plate")
+
+### Azure
+
+To find the license plate for an Azure Project Set, follow these steps:
+
+1. Log in to the [Azure Portal](https://portal.azure.com/).
+2. Search for **Management Groups**.
+3. Expand **BCGov-Managed-LZ** > **BCGov-Managed-LZ-Live** > **Landing Zones** and locate your Project Set's Management Group.
+4. The alphanumeric code in the **Name** column (for the Management Group, or Subscription) is the license plate for your Project Set.
+
+  - If your Management Group or Subscription name has been changed, the Management Group ID field will contain the original license plate.
+
+![Azure Project Set License Plate](../images/support/project-set-license-plate-example-azure.png "Azure Project Set License Plate")
+
 ## Support options
 
 There are multiple ways to get support for the Public Cloud Platform, including: