Add druid quickstart guide

Signed-off-by: Tapajit Chandra Paul <[email protected]>

docs/guides/druid/README.md

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+---
+title: Kafka
+menu:
+  docs_{{ .version }}:
+    identifier: kf-readme-kafka
+    name: Kafka
+    parent: kf-kafka-guides
+    weight: 10
+menu_name: docs_{{ .version }}
+section_menu_id: guides
+url: /docs/{{ .version }}/guides/kafka/
+aliases:
+  - /docs/{{ .version }}/guides/kafka/README/
+---
+
+> New to KubeDB? Please start [here](/docs/README.md).
+
+## Supported Kafka Features
+
+
+| Features                                                       | Community | Enterprise |
+|----------------------------------------------------------------|:---------:|:----------:|
+| Clustering - Combined (shared controller and broker nodes)     | ✓  |  ✓  |
+| Clustering - Topology (dedicated controllers and broker nodes) | ✓  |  ✓  |
+| Custom Docker Image                                            | ✓  |  ✓  |
+| Authentication & Authorization                                 | ✓  |  ✓  |
+| Persistent Volume                                              | ✓  |  ✓  |
+| Custom Volume                                                  | ✓  |  ✓  |
+| TLS: using ( [Cert Manager](https://cert-manager.io/docs/) )   | ✗  |  ✓  |
+| Reconfigurable Health Checker                                  | ✓  |  ✓  |
+| Externally manageable Auth Secret                              | ✓  |  ✓  |
+| Monitoring with Prometheus & Grafana                           | ✓  |  ✓  |
+
+## Supported Kafka Versions
+
+KubeDB supports The following Kafka versions. Supported version are applicable for Kraft mode or Zookeeper-less releases:
+- `3.3.0`
+- `3.3.2`
+- `3.4.0`
+
+> The listed KafkaVersions are tested and provided as a part of the installation process (ie. catalog chart), but you are open to create your own [KafkaVersion](/docs/guides/kafka/concepts/catalog.md) object with your custom Kafka image.
+
+## Lifecycle of Kafka Object
+
+<!---
+ref : https://cacoo.com/diagrams/4PxSEzhFdNJRIbIb/0281B
+--->
+
+<p align="center">
+<img alt="lifecycle"  src="/docs/images/kafka/Kafka-CRD-Lifecycle.png">
+</p>
+
+## User Guide 
+- [Quickstart Kafka](/docs/guides/kafka/quickstart/overview/index.md) with KubeDB Operator.
+- Kafka Clustering supported by KubeDB
+  - [Combined Clustering](/docs/guides/kafka/clustering/combined-cluster/index.md)
+  - [Topology Clustering](/docs/guides/kafka/clustering/topology-cluster/index.md)
+- Use [kubedb cli](/docs/guides/kafka/cli/cli.md) to manage databases like kubectl for Kubernetes.
+- Detail concepts of [Kafka object](/docs/guides/kafka/concepts/kafka.md).
+- Want to hack on KubeDB? Check our [contribution guidelines](/docs/CONTRIBUTING.md).

docs/guides/druid/_index.md

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+---
+title: Druid
+menu:
+  docs_{{ .version }}:
+    identifier: dr-druid-guides
+    name: Druid
+    parent: guides
+    weight: 10
+menu_name: docs_{{ .version }}
+---

docs/guides/druid/quickstart/_index.md

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+---
+title: Druid Quickstart
+menu:
+  docs_{{ .version }}:
+    identifier: dr-quickstart-druid
+    name: Quickstart
+    parent: dr-druid-guides
+    weight: 15
+menu_name: docs_{{ .version }}
+---