[#2695] feat(doc): Add docs for fileset catalog (#2781)

### What changes were proposed in this pull request?

This PR proposes to add docs for fileset catalog.

### Why are the changes needed?

Fix: #2695 

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

No.

docs/hadoop-catalog.md

@@ -0,0 +1,63 @@
+---
+title: "Hadoop catalog"
+slug: /hadoop-catalog
+date: 2024-4-2
+keyword: hadoop catalog
+license: "Copyright 2024 Datastrato Pvt Ltd.
+This software is licensed under the Apache License version 2."
+---
+
+## Introduction
+
+Hadoop catalog is a fileset catalog that using Hadoop Compatible File System (HCFS) to manage
+the storage location of the fileset. Currently, it supports local filesystem and HDFS. For
+object storage like S3, GCS, and Azure Blob Storage, you can put the hadoop object store jar like
+hadoop-aws into the `$GRAVITINO_HOME/catalogs/hadoop/libs` directory to enable the support.
+Gravitino itself hasn't yet tested the object storage support, so if you have any issue,
+please create an [issue](https://github.com/datastrato/gravitino/issues).
+
+Note that Gravitino uses Hadoop 3 dependencies to build Hadoop catalog. Theoretically, it should be
+compatible with both Hadoop 2.x and 3.x, since Gravitino doesn't leverage any new features in
+Hadoop 3. If there's any compatibility issue, please create an [issue](https://github.com/datastrato/gravitino/issues).
+
+## Catalog
+
+### Catalog properties
+
+| Property Name | Description                                     | Default Value | Required | Since Version |
+|---------------|-------------------------------------------------|---------------|----------|---------------|
+| `location`    | The storage location managed by Hadoop catalog. | (none)        | No       | 0.5.0         |
+
+### Catalog operations
+
+Refer to [Catalog operations](./manage-fileset-metadata-using-gravitino.md#catalog-operations) for more details.
+
+## Schema
+
+### Schema capabilities
+
+The Hadoop catalog supports creating, updating, deleting, and listing schema.
+
+### Schema properties
+
+| Property name | Description                                    | Default value | Required | Since Version |
+|---------------|------------------------------------------------|---------------|----------|---------------|
+| `location`    | The storage location managed by Hadoop schema. | (none)        | No       | 0.5.0         |
+
+### Schema operations
+
+Refer to [Schema operation](./manage-fileset-metadata-using-gravitino.md#schema-operations) for more details.
+
+## Fileset
+
+### Fileset capabilities
+
+- The Hadoop catalog supports creating, updating, deleting, and listing filesets.
+
+### Fileset properties
+
+None.
+
+### Fileset operations
+
+Refer to [Fileset operations](./manage-fileset-metadata-using-gravitino.md#fileset-operations) for more details.

docs/index.md

@@ -53,6 +53,8 @@ REST API and the Java SDK. You can use either to manage metadata. See
   metalakes.
 * [Manage relational metadata using Gravitino](./manage-relational-metadata-using-gravitino.md)
   to learn how to manage relational metadata.
+* [Manage fileset metadata using Gravitino](./manage-fileset-metadata-using-gravitino.md) to learn
+  how to manage fileset metadata.
 
 Also, you can find the complete REST API definition in
 [Gravitino Open API](./api/rest/gravitino-rest-api), and the
@@ -69,6 +71,10 @@ Gravitino currently supports the following catalogs:
 * [**MySQL catalog**](./jdbc-mysql-catalog.md)
 * [**PostgreSQL catalog**](./jdbc-postgresql-catalog.md)
 
+**Fileset catalogs:**
+
+* [**Hadoop catalog**](./hadoop-catalog.md)
+
 Gravitino also provides an Iceberg REST catalog service for the Iceberg table format. See the
 [Iceberg REST catalog service](./iceberg-rest-service.md) for details.
 
@@ -99,6 +105,8 @@ Gravitino supports different catalogs to manage the metadata in different source
 * [Hive catalog](./apache-hive-catalog.md): a complete guide to using Gravitino to manage Apache Hive data.
 * [MySQL catalog](./jdbc-mysql-catalog.md): a complete guide to using Gravitino to manage MySQL data.
 * [PostgreSQL catalog](./jdbc-postgresql-catalog.md): a complete guide to using Gravitino to manage PostgreSQL data.
+* [Hadoop catalog](./hadoop-catalog.md): a complete guide to using Gravitino to manage fileset
+  using Hadoop Compatible File System (HCFS).
 
 ### Trino connector