Added documentation for managed identity support in repository-azure plugin

_tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

@@ -207,7 +207,7 @@
 You will most likely not need to specify any parameters except for `bucket` and `base_path`. For allowed request parameters, see [Register or update snapshot repository API](https://opensearch.org/docs/latest/api-reference/snapshots/create-repository/).
 
 
-### Registering an Azure storage account
+### Registering an Azure storage account using Helm 
 
 Use the following steps to register a snapshot repository backed by an Azure storage account for an OpenSearch cluster deployed using Helm.
 
@@ -296,6 +296,55 @@
    }
    ```
 
+### General set up to use Microsoft Azure Blob Storage
+
+To utilize Microsoft Azure Blob Storage as a snapshot repository, follow the steps below:
+1. Install the `repository-azure` plugin on all nodes with the following command:
+
+   ```bash
+   ./bin/opensearch-plugin install repository-azure
+   ```
+
+1. Once the repository-azure plugin is installed, define your Azure Blob Storage settings before initializing the node. Start by defining your Azure Storage account name using the following secure setting:
+
+   ```bash
+   ./bin/opensearch-keystore add azure.client.default.account
+   ```
+
+1. choose one of the following options to set up your authentication credentials for Azure Blob Storage:
+
+   #### Using Azure storage account key
+
+   Use the following setting to specify your Azure Storage account key:
+
+   ```bash 
+   ./bin/opensearch-keystore add azure.client.default.key
+   ```
+
+   #### Shared access signature (SAS)
+
+   Use the following setting when accessing Azure with a shared access signature:
+
+   ```bash
+   ./bin/opensearch-keystore add azure.client.default.sas_token      
+   ```
+
+   #### Azure token credential 
+
+   Starting from OpenSearch 2.15.0, you have the option to configure a token credential authentication flow in `opensearch.yml`. This method is distinct from connection string authentication, which necessitates a SAS or an account key.
+
+   If you opt for token credential authentication, you will need to choose a token credential type. Although Azure offers multiple token credential types, as of OpenSearch version 2.15.0, only managed identity is supported.
+
+   To use managed identity, add your token credential type to `opensearch.yml` using either `managed` or `managed_identity` values. This indicates that managed identity is being used to perform token credential authentication:
+
+   ```yml
+   azure.client.default.token_credential_type: "managed_identity"
+   ``` 
+
+   Remember the following information when using Azure token credentials:
+      - Token credential support is disabled in `opensearch.yml` by default.
+      - Token credentials will take precedent over Azure Storage account key or SAS when multiple options are configured. 
+
 ## Take snapshots
 
 You specify two pieces of information when you create a snapshot: