Create README template

Author: aamini7

scenarios/AksOpenAiTerraform/README.md

@@ -8,11 +8,40 @@ ms.author: ariaamini
 ms.custom: innovation-engine, linux-related-content 
 ---
 
+<!-- TODO: PARAMETERIZE REGION AND SUB IDS  -->
+
 ## Install AKS extension
 
 Run commands below to set up AKS extensions for Azure.
 
 ```bash
-# ./terraform/register-preview-features.sh
-echo "HI"
-```
+./terraform/register-preview-features.sh
+```
+
+## Set up service principal
+
+A Service Principal is an application within Azure Active Directory with the authentication tokens Terraform needs to perform actions on your behalf.
+
+```bash
+# TODO: fix
+# az ad sp create-for-rbac --role="Contributor" --scopes="/subscriptions/$ARM_SUBSCRIPTION_ID"
+```
+
+## Setup Infra
+
+```bash
+export ARM_SUBSCRIPTION_ID="0c8875c7-e423-4caa-827a-1f0350bd8dd3"
+# For debugging in powershell
+# $env:ARM_SUBSCRIPTION_ID = "0c8875c7-e423-4caa-827a-1f0350bd8dd3"
+
+terraform apply
+```
+
+## Set up environment
+
+```bash
+export ARM_CLIENT_ID=""
+export ARM_CLIENT_SECRET=""
+export ARM_SUBSCRIPTION_ID=""
+export ARM_TENANT_ID=""
+```