Add druid quickstart guide

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

docs/examples/druid/quickstart/minio-tenant-override.yaml

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+tenant:
+  pools:
+  - servers: 1
+    volumesPerServer: 1
+    size: 1Gi
+  certificate:
+    requestAutoCert: false
+  buckets: 
+  - name: "druid"

docs/examples/druid/quickstart/mysql-demo.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: MySQL
+metadata:
+  name: mysql-demo
+  namespace: druid
+spec:
+  version: "8.0.35"
+  storage:
+    storageClassName: "standard"
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 100Mi
+  init:
+    script:
+      configMap:
+        name: my-init-script

docs/examples/druid/quickstart/mysql-init-script.sql

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+CREATE DATABASE druid;
+

docs/examples/druid/quickstart/zk-demo.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: ZooKeeper
+metadata:
+  name: zk-demo
+  namespace: druid
+spec:
+  version: "3.7.2"
+  replicas: 1
+  storage:
+    resources:
+      requests:
+        storage: "100Mi"
+    storageClassName: "standard"
+    accessModes:
+      - ReadWriteOnce
+  terminationPolicy: "WipeOut"

docs/guides/druid/README.md

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+---
+title: Druid
+menu:
+  docs_{{ .version }}:
+    identifier: dr-readme-druid
+    name: Druid
+    parent: dr-druid-guides
+    weight: 10
+menu_name: docs_{{ .version }}
+section_menu_id: guides
+url: /docs/{{ .version }}/guides/druid/
+aliases:
+  - /docs/{{ .version }}/guides/druid/README/
+---
+
+> New to KubeDB? Please start [here](/docs/README.md).
+
+## Supported Druid Features
+
+
+| Features                             | Availability |
+|--------------------------------------|:------------:|
+| Clustering                           |   ✓   |
+| Authentication                       |   ✓   |
+| Custom Configuration                 |   ✓   |
+| Monitoring with Prometheus & Grafana |   ✓   |
+| Builtin Prometheus Discovery         |   ✓   |
+| Using Prometheus operator            |   ✓   |
+| Externally manageable Auth Secret    |   ✓   |
+| Reconfigurable Health Checker        |   ✓   |
+| Persistent volume                    |   ✓   | 
+| Druid Web Console                    |   ✓   |
+
+## Supported Druid Versions
+
+KubeDB supports The following Druid versions.
+- `25.0.0`
+- `28.0.1`
+
+> The listed DruidVersions are tested and provided as a part of the installation process (ie. catalog chart), but you are open to create your own [DruidVersion](/docs/guides/druid/concepts/catalog.md) object with your custom Druid image.
+
+## Lifecycle of Druid Object
+
+<!---
+ref : https://cacoo.com/diagrams/bbB63L6KRIbPLl95/9A5B0
+--->
+
+<p align="center">
+<img alt="lifecycle"  src="/docs/images/druid/Druid-CRD-Lifecycle.png">
+</p>
+
+## User Guide 
+- [Quickstart Druid](/docs/guides/druid/quickstart/overview/index.md) with KubeDB Operator.
+
+[//]: # (- Druid Clustering supported by KubeDB)
+
+[//]: # (  - [Topology Clustering]&#40;/docs/guides/druid/clustering/topology-cluster/index.md&#41;)
+
+[//]: # (- Use [kubedb cli]&#40;/docs/guides/druid/cli/cli.md&#41; to manage databases like kubectl for Kubernetes.)
+
+[//]: # (- Detail concepts of [Druid object]&#40;/docs/guides/druid/concepts/druid.md&#41;.)
+
+[//]: # (- Want to hack on KubeDB? Check our [contribution guidelines]&#40;/docs/CONTRIBUTING.md&#41;.)

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 }}
+---