Write create docs for all DBs (#125)

Signed-off-by: Arnob kumar saha <arnob@appscode.com>

Author: ArnobKumarSaha

docs/platform/guides/database-management/create-database.md

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+---
+layout: docs
+menu:
+  docsplatform_{{.version}}:
+    identifier: database-management-create
+    name: Creating a Database
+    parent: database-management
+    weight: 10
+menu_name: docsplatform_{{.version}}
+section_menu_id: guides
+---
+
+# Creating a Database
+
+Creating a database is a multi-step wizard: select a database engine, set a name and
+namespace, configure topology and resources, and enable optional features like
+monitoring, TLS, and backups.
+
+The overall flow is the same for every engine and is documented once in
+[**Common Steps**](common-steps.md). Where it differs is the **Database Mode** (topology)
+and a handful of engine-specific settings — pick your engine below for a guide tailored to
+it, then follow the common steps for everything else.
+
+---
+
+## Supported Engines
+
+### Relational
+- [PostgreSQL](postgres.md)
+- [MySQL](mysql.md)
+- [MariaDB](mariadb.md)
+- [Percona XtraDB](perconaxtradb.md)
+- [Microsoft SQL Server](mssqlserver.md)
+- [Oracle](oracle.md)
+- [SingleStore](singlestore.md)
+- [IBM Db2](db2.md)
+- [SAP HANA](hanadb.md)
+
+### Document & Search
+- [MongoDB](mongodb.md)
+- [Elasticsearch](elasticsearch.md)
+- [Solr](solr.md)
+- [DocumentDB](documentdb.md)
+
+### Key-Value & Cache
+- [Redis](redis.md)
+- [Memcached](memcached.md)
+- [Ignite](ignite.md)
+- [Hazelcast](hazelcast.md)
+
+### Vector
+- [Qdrant](qdrant.md)
+- [Milvus](milvus.md)
+- [Weaviate](weaviate.md)
+
+### Wide-column & Time-series
+- [Cassandra](cassandra.md)
+- [ClickHouse](clickhouse.md)
+- [Druid](druid.md)
+
+### Streaming & Messaging
+- [Kafka](kafka.md)
+- [RabbitMQ](rabbitmq.md)
+
+### Graph
+- [Neo4j](neo4j.md)
+
+### Coordination
+- [ZooKeeper](zookeeper.md)
+
+### Connection Poolers & Proxies
+- [PgBouncer](pgbouncer.md)
+- [Pgpool](pgpool.md)
+- [ProxySQL](proxysql.md)

docs/platform/guides/database-management/create-database/_index.md

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+---
+layout: docs
+menu:
+  docsplatform_{{.version}}:
+    identifier: database-management-create-cassandra
+    name: Cassandra
+    parent: database-management-create
+    weight: 210
+menu_name: docsplatform_{{.version}}
+section_menu_id: guides
+---
+
+
+# Creating a Cassandra Database
+
+This page covers the configuration specific to **Cassandra** — its **Database Mode** and any engine-specific settings shown below. The rest of the creation flow —
+opening the wizard, namespace and name, version, machine profile, storage, and optional
+features — is the same for every engine and is documented in [Common Steps](common-steps.md).
+
+## Database Mode
+
+Select the topology under **Database Mode**:
+
+- **Standalone** — A single-node Cassandra instance for development or testing.
+- **Topology** — A multi-node Cassandra cluster, optionally organized into named **Racks** for rack-aware replication.
+
+![Topology mode selected showing Racks configuration](../images/db-create/cassandra/topology-mode.png)
+
+| Field | Description |
+|---|---|
+| **Number of Replicas** | Number of Cassandra nodes (e.g., `3`). Required. |
+| **Racks** | Optional list of rack names to spread nodes across for fault tolerance. |
+
+## Create a Cassandra Database
+
+1. Open the wizard and select **Cassandra** — see [Getting Started](common-steps.md#1-getting-started) and [Select a Database Type](common-steps.md#2-select-a-database-type).
+1. Set the [namespace and name](common-steps.md#3-choose-namespace-and-name).
+1. Pick the database version and the **Database Mode** described above, then set the machine profile and storage — see [Configure the Database](common-steps.md#4-configure-the-database).
+1. Optionally configure [Advanced Configuration](common-steps.md#5-advanced-configuration) (labels, deletion policy, credentials, point-in-time recovery) and [Additional Options](common-steps.md#6-additional-options) (monitoring, backup, TLS, gateway).
+1. Click [**Deploy**](common-steps.md#7-deploy).