Add release process

release-process.md

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+# Release Process
+
+This document outlines the steps involved in the release process for the NGINX Plus Go Client project.
+
+## Versioning
+
+The project follows [Semantic Versioning](https://semver.org/) for versioning.
+
+## Release Planning and Development
+
+The features that will go into the next release are reflected in the
+corresponding [milestone](https://github.com/nginxinc/nginx-plus-go-client/milestones). Refer to
+the [Issue Lifecycle](/ISSUE_LIFECYCLE.md) document for information on issue creation and assignment to releases.
+
+## Releasing a New Version
+
+1. Create an issue to define and track release-related activities. Choose a title that follows the
+   format `Release X.Y.Z`.
+2. Stop merging any new work into the main branch.
+3. Check the release draft under the [GitHub releases](https://github.com/nginxinc/nginx-plus-go-client/releases) page
+to ensure that everything is in order.
+4. Create and push the release tag in the format `vX.Y.Z`:
+
+    ```bash
+    git tag -a vX.Y.Z -m "Release vX.Y.Z"
+    git push origin vX.Y.Z
+    ```
+
+    As a result, the CI/CD pipeline will publish the release and announce it in the community Slack.