Update TroubleShootingSteps.md

Author: Roopan-Microsoft

docs/TroubleShootingSteps.md

@@ -4,6 +4,20 @@ When deploying Azure resources, you may come across different error codes that s
 
 Use these as quick reference guides to unblock your deployments.
 
+## 📘 Index
+
+- [Subscription & Access Issues](#subscription--access-issues)
+- [Quota & Capacity Limitations](#quota--capacity-limitations)
+- [Resource Group & Deployment Management](#resource-group--deployment-management)
+- [Regional & Location Issues](#regional--location-issues)
+- [Resource Naming & Validation](#resource-naming--validation)
+- [Resource Identification & References](#resource-identification--references)
+- [Network & Infrastructure Configuration](#network--infrastructure-configuration)
+- [Configuration & Property Errors](#configuration--property-errors)
+- [Resource State & Provisioning](#resource-state--provisioning)
+- [Miscellaneous](#miscellaneous)
+
+
 ## Subscription & Access Issues
 
 | Issue/Error Code | Description | Steps to Resolve |