[Docs] Add a release notes template (#15333)

* Add release notes template

* Update spellcheck

docs/release-info/release-notes.md

@@ -0,0 +1,106 @@
+---
+id: release-notes
+title: "Release notes"
+---
+
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+
+<!--Replace {{DRUIDVERSION}} with the correct Druid version.-->
+
+Apache Druid {{DRUIDVERSION}} contains over $NUMBER_FEATURES new features, bug fixes, performance enhancements, documentation improvements, and additional test coverage from $NUMBER_OF_CONTRIBUTORS contributors.
+
+<!--
+Replace {{MILESTONE}} with the correct milestone number. For example: https://github.com/apache/druid/issues?q=is%3Aclosed+milestone%3A28.0+sort%3Aupdated-desc+
+-->
+
+See the [complete set of changes](https://github.com/apache/druid/issues?q=is%3Aclosed+milestone%3A{{MILESTONE}}+sort%3Aupdated-desc+) for additional details, including bug fixes.
+
+Review the [upgrade notes](#upgrade-notes) and [incompatible changes](#incompatible-changes) before you upgrade to Druid {{DRUIDVERSION}}.
+If you are upgrading across multiple versions, see the [Upgrade notes](upgrade-notes.md) page, which lists upgrade notes for the most recent Druid versions.
+
+<!-- 
+This file is a collaborative work in process. Adding a release note to this file doesn't guarantee its presence in the next release until the release branch is cut and the release notes are finalized.
+
+This file contains the following sections:
+- Important features, changes, and deprecations
+- Functional area and related changes
+- Upgrade notes and incompatible changes
+
+Please add your release note to the appropriate section and include the following:
+- Detailed title
+- Summary of the changes (a couple of sentences) aimed at Druid users
+- Link to the associated PR
+
+If your release note contains images, put the images in the release-info/assets folder.
+
+For tips about how to write a good release note, see [Release notes](https://github.com/apache/druid/blob/master/CONTRIBUTING.md#release-notes).
+-->
+
+## Important features, changes, and deprecations
+
+This section contains important information about new and existing features.
+
+## Functional area and related changes
+
+This section contains detailed release notes separated by areas.
+
+### Web console
+
+#### Other web console improvements
+
+### Ingestion
+
+#### SQL-based ingestion
+
+##### Other SQL-based ingestion improvements
+
+#### Streaming ingestion
+
+##### Other streaming ingestion improvements
+
+### Querying
+
+#### Other querying improvements
+
+### Cluster management
+
+#### Other cluster management improvements
+
+### Data management
+
+#### Other data management improvements
+
+### Metrics and monitoring
+
+### Extensions
+
+### Documentation improvements
+
+## Upgrade notes and incompatible changes
+
+### Upgrade notes
+
+### Incompatible changes
+
+### Developer notes
+
+#### Dependency updates
+
+The following dependencies have had their versions bumped: