[#1469] improvement(doc): Add doc about webUI operation (#1281)

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

Compose documentation for the webUI, detailing the procedures for CRUD
operations.

### Why are the changes needed?

Fix: #1269 

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

N/A

### How was this patch tested?

N/A

Co-authored-by: CHEYNE <contact@ch3yne.com>

docs/webui.md

@@ -0,0 +1,248 @@
+---
+title: 'Gravitino web UI'
+slug: /webui
+keyword: webui
+toc_min_heading_level: 2
+toc_max_heading_level: 5
+license: 'Copyright 2023 Datastrato Pvt Ltd. This software is licensed under the Apache License version 2.'
+---
+
+import Image from '@theme/IdealImage'
+import Tabs from '@theme/Tabs'
+import TabItem from '@theme/TabItem'
+
+This document primarily outlines how users can manage metadata within Gravitino using the web UI, the graphical interface is accessible through a web browser as an alterative to writing code or using the REST interface.
+
+Currently, you can integrate [OAuth settings](security.md) to view, add, modify, and delete metalakes, create catalogs, and view catalogs, schemas, and tables, among other functions.
+
+:::caution
+More features are under development. For the details, please refer to the [Manage metadata using Gravitino](manage-metadata-using-gravitino.md) document.
+:::
+
+[Build](how-to-build.md#quick-start) and [deploy](getting-started.md#getting-started-locally) the Gravitino Web UI and open it in a browser at `http://<gravitino-host>:<gravitino-port>`, by default is [http://localhost:8090](http://localhost:8090).
+
+## Initial page
+
+The web UI homepage displayed in Gravitino depends on the configuration parameter for OAuth mode, see the details in [Security](security.md).
+
+Set parameter for `gravitino.authenticator`, [`simple`](#simple-mode) or [`oauth`](#oauth-mode).
+
+:::tip
+After changing the configuration, make sure to restart the Gravitino server.
+
+`<path-to-gravitino>/bin/gravitino.sh restart`
+:::
+
+### Simple mode
+
+```
+gravitino.authenticator = simple
+```
+
+Set the configuration parameter `gravitino.authenticator` to `simple`, the web UI displays the homepage (Metalakes).
+
+![webui-metalakes-simple](assets/webui/metalakes-simple.png)
+
+At the top-right, the UI displays the current Gravitino version.
+
+The main content displays the existing metalake list.
+
+### Oauth mode
+
+```
+gravitino.authenticator = oauth
+```
+
+Set the configuration parameter `gravitino.authenticator` to `oauth`, the web UI displays the login page.
+
+![webui-login-with-oauth](assets/webui/login-with-oauth.png)
+
+1. Enter the values corresponding to your specific configuration. For detailed instructions, please refer to [Security](security.md).
+
+2. Clicking on the `LOGIN` button takes you to the homepage.
+
+![webui-metalakes-oauth](assets/webui/metalakes-oauth.png)
+
+At the top-right, there is an icon button that takes you to the login page when clicked.
+
+## Manage metadata
+
+> All the manage actions are performed by using the [REST API](api/rest/gravitino-rest-api)
+
+### Metalake
+
+#### [Create a metalake](getting-started.md#using-rest-to-interact-with-gravitino)
+
+On the homepage, clicking on the `CREATE METALAKE` button displays a dialog to create a metalake.
+
+![create-metalake-dialog](assets/webui/create-metalake-dialog.png)
+
+Creating a metalake needs these fields:
+
+1. **Name**(**_required_**): the name of the metalake.
+2. **Comment**(_optional_): the comment of the metalake.
+3. **Properties**(_optional_): clicking on the `ADD PROPERTY` button to add custom properties.
+
+![metalake-list](assets/webui/metalake-list.png)
+
+There are 3 actions you can perform on a metalake.
+
+![metalake-actions](assets/webui/metalake-actions.png)
+
+#### Show metalake details
+
+![metalake-details](assets/webui/metalake-details.png)
+
+#### Edit metalake
+
+Displays a dialog for for modifying a metalakes fields.
+
+![create-metalake-dialog](assets/webui/create-metalake-dialog.png)
+
+#### Delete metalake
+
+Displays a confirmation dialog, clicking on the `SUBMIT` button deletes this metalake.
+
+![delete-metalake](assets/webui/delete-metalake.png)
+
+### Catalog
+
+Clicking on a metalake name in the table views catalogs in a metalake.
+
+If this is the first time, it shows no data until after creating a catalog.
+
+![metalake-catalogs](assets/webui/metalake-catalogs.png)
+
+Clicking on the Tab - `DETAILS` views the details of the catalog in the metalake catalogs page.
+
+![metalake-catalogs-details](assets/webui/metalake-catalogs-details.png)
+
+#### Create a catalog
+
+Clicking on the `CREATE CATALOG` button displays a dialog to create a catalog.
+
+![create-catalog](assets/webui/create-catalog.png)
+
+Creating a catalog requires these fields:
+
+1. **Catalog name**(**_required_**): the name of the catalog
+2. **Type**(**_required_**): the default value is `relational`
+3. **Provider**(**_required_**): `hive`/`iceberg`/`mysql`/`postgresql`
+4. **Comment**(_optional_): the comment of this catalog
+5. **Properties**(**each `provider` must fill in the required property fields specifically**)
+
+##### Providers
+
+> Required properties in various providers
+
+<Tabs>
+  <TabItem value='hive' label='Hive'>
+    Follow the [Apache Hive catalog](apache-hive-catalog) document
+
+    <Image img={require('./assets/webui/props-hive.png')} style={{ width: 480 }} />
+
+    |Key           |Description                                           |
+    |--------------|------------------------------------------------------|
+    |metastore.uris|The Hive metastore URIs e.g. `thrift://127.0.0.1:9083`|
+
+  </TabItem>
+  <TabItem value='iceberg' label='Iceberg'>
+    Follow the [Lakehouse Iceberg catalog](lakehouse-iceberg-catalog) document
+
+    the parameter `catalog-backend` provides two values: `hive`, and `jdbc`.
+
+    |Key            |Description      |
+    |---------------|-----------------|
+    |catalog-backend|`hive`, or `jdbc`|
+
+    - `hive`
+
+    <Image img={require('./assets/webui/props-iceberg-hive.png')} style={{ width: 480 }} />
+
+    |Key      |Description                     |
+    |---------|--------------------------------|
+    |uri      |Iceberg catalog URI config      |
+    |warehouse|Iceberg catalog warehouse config|
+
+    - `jdbc`
+
+    <Image img={require('./assets/webui/props-iceberg-jdbc.png')} style={{ width: 480 }} />
+
+    |Key          |Description                                                                                            |
+    |-------------|-------------------------------------------------------------------------------------------------------|
+    |uri          |Iceberg catalog URI config                                                                             |
+    |warehouse    |Iceberg catalog warehouse config                                                                       |
+    |jdbc-driver  |"com.mysql.jdbc.Driver" or "com.mysql.cj.jdbc.Driver" for MySQL, "org.postgresql.Driver" for PostgreSQL|
+    |jdbc-user    |jdbc username                                                                                          |
+    |jdbc-password|jdbc password                                                                                          |
+
+  </TabItem>
+  <TabItem value='mysql' label='MySQL'>
+    Follow the [JDBC MySQL catalog](jdbc-mysql-catalog) document
+
+    <Image img={require('./assets/webui/props-mysql.png')} style={{ width: 480 }} />
+
+    |Key          |Description                                                                                        |
+    |-------------|---------------------------------------------------------------------------------------------------|
+    |jdbc-driver  |JDBC URL for connecting to the database. e.g. `com.mysql.jdbc.Driver` or `com.mysql.cj.jdbc.Driver`|
+    |jdbc-url     |e.g. `jdbc:mysql://localhost:3306`                                                                 |
+    |jdbc-user    |The JDBC user name                                                                                 |
+    |jdbc-password|The JDBC password                                                                                  |
+
+  </TabItem>
+  <TabItem value='postgresql' label='PostgreSQL'>
+    Follow the [JDBC PostgreSQL catalog](jdbc-postgresql-catalog) document
+
+    <Image img={require('./assets/webui/props-pg.png')} style={{ width: 480 }} />
+
+    |Key          |Description                                          |
+    |-------------|-----------------------------------------------------|
+    |jdbc-driver  |e.g. `e.g. org.postgresql.Driver`                    |
+    |jdbc-url     |e.g. `jdbc:postgresql://localhost:5432/your_database`|
+    |jdbc-user    |The JDBC user name                                   |
+    |jdbc-password|The JDBC password                                    |
+    |jdbc-database|e.g. `pg_database`                                   |
+
+  </TabItem>
+</Tabs>
+
+After verifying the values of these fields, clicking on the `CREATE` button creates a catalog.
+
+![created-catalog](assets/webui/created-catalog.png)
+
+Clicking on the icon button - `←(left arrow)` takes you to the metalake page.
+
+### Schema
+
+Under Construction...
+
+- [x] View
+- [ ] Create
+- [ ] Edit
+- [ ] Delete
+
+Design draft preview:
+
+![demo-tables](assets/webui/demo-tables.png)
+
+### Table
+
+Under Construction...
+
+- [x] View
+- [ ] Create
+- [ ] Edit
+- [ ] Delete
+
+Design draft preview:
+
+![demo-columns](assets/webui/demo-columns.png)
+
+## Feature capabilities
+
+| Page     | Capabilities                                                                      |
+| -------- | --------------------------------------------------------------------------------- |
+| Metalake | _`View`_ &#10004; / _`Create`_ &#10004; / _`Edit`_ &#10004; / _`Delete`_ &#10004; |
+| Catalog  | _`View`_ &#10004; / _`Create`_ &#10004; / _`Edit`_ &#10008; / _`Delete`_ &#10008; |
+| Schema   | _`View`_ &#10004; / _`Create`_ &#10008; / _`Edit`_ &#10008; / _`Delete`_ &#10008; |
+| Table    | _`View`_ &#10004; / _`Create`_ &#10008; / _`Edit`_ &#10008; / _`Delete`_ &#10008; |