[docs] Add Azure Blob Storage documentation (#2507)

Author: gkatzioura

website/docs/maintenance/filesystems/azure.md

@@ -0,0 +1,43 @@
+---
+title: Azure Blob Storage
+sidebar_position: 5
+---
+
+# Azure Blob Storage
+
+[Azure Blob Storage](https://azure.microsoft.com/en-us/products/storage/blobs) (Azure Blob Storage) is a massively scalable and secure object storage for cloud-native workloads, archives, data lakes, HPC, and machine learning.
+
+## Install Azure FS Plugin Manually
+
+Azure Blob Storage support is not included in the default Fluss distribution. To enable Azure Blob Storage support, you need to manually install the filesystem plugin into Fluss.
+
+1. **Prepare the plugin JAR**:
+
+    - Download the `fluss-fs-azure-$FLUSS_VERSION$.jar` from the [Maven Repository](https://repo1.maven.org/maven2/org/apache/fluss/fluss-fs-azure/$FLUSS_VERSION$/fluss-fs-azure-$FLUSS_VERSION$.jar).
+
+2. **Place the plugin**: Place the plugin JAR file in the `${FLUSS_HOME}/plugins/azure/` directory:
+   ```bash
+   mkdir -p ${FLUSS_HOME}/plugins/azure/
+   cp fluss-fs-azure-$FLUSS_VERSION$.jar ${FLUSS_HOME}/plugins/azure/
+   ```
+
+3. Restart Fluss if the cluster is already running to ensure the new plugin is loaded.
+
+## Configurations setup
+
+To enabled Azure Blob Storage as remote storage, there are some required configurations that must be added to Fluss' `server.yaml`:
+
+```yaml
+# The dir that used to be as the remote storage of Fluss, use the Azure Data Lake Storage URI
+remote.data.dir: abfs://[email protected]/path
+# the access key for the azure blob storage account
+fs.azure.account.key: 09a295d5-3da5-4435-a660-f438b331ade8
+# The oauth account provider type for Token-based Authentication
+fs.azure.account.oauth.provider.type: org.apache.fluss.fs.azure.token.DynamicTemporaryAzureCredentialsProvider
+# The oauth2 client id for Token-based Authentication
+fs.azure.account.oauth2.client.id: ed953f8a-d5e9-481c-b355-62794f178f66
+# The oauth2 client secret for Token-based Authentication
+fs.azure.account.oauth2.client.secret: ec29f904-64f6-4372-831a-dc28ec818683
+# The oauth2 endpoint to generate access tokens for Token-based Authentication
+fs.azure.account.oauth2.client.endpoint: https://login.microsoftonline.com/154b1d91-2d07-4e3a-beb6-9261ab4926ab/oauth2/token
+```

website/docs/maintenance/filesystems/overview.md

@@ -36,6 +36,8 @@ The Fluss project supports the following file systems:
 
 - **[AWS S3](s3.md)** is supported by `fluss-fs-s3` and registered under the `s3://` URI scheme.
 
+- **[Azure Blob Storage](azure.md)** is supported by `fluss-fs-azure` and registered under the `abfs://`,`abfss://`,`wasb://`,`wasbs://`, URI schemes.
+
 - **[HuaweiCloud OBS](obs.md)** is supported by `fluss-fs-obs` and registered under the `obs://` URI scheme. Please make sure to [manually install the OBS plugin](obs.md#install-obs-plugin-manually).
 
 The implementation is based on [Hadoop Project](https://hadoop.apache.org/) but is self-contained with no dependency footprint.