add root README

Author: saurabh3460

codebundles/azure-planned-maintenance/README.md

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+# Azure Planned Maintenance
+This codebundle runs a suite of metrics checks for planned maintenance events in Azure. It identifies:
+- Check for planned maintenance events
+
+## Configuration
+
+The TaskSet requires initialization to import necessary secrets, services, and user variables. The following variables should be set:
+
+- `AZ_USERNAME`: Service principal's client ID
+- `AZ_SECRET_VALUE`: The credential secret value from the app registration
+- `AZ_TENANT`: The Azure tenancy ID
+- `AZ_SUBSCRIPTION`: The Azure subscription ID
+
+## Testing 
+See the .test directory for infrastructure test code. 
+
+## Notes
+
+This codebundle assumes the service principal authentication flow