docs: release procedure

Closes #371

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>

Author: gbartolini

README.md

@@ -4,3 +4,42 @@
 
 The documentation for the Barman Cloud Plugin for CloudNativePG is available at
 [https://cloudnative-pg.io/plugin-barman-cloud](https://cloudnative-pg.github.io/plugin-barman-cloud).
+
+---
+
+The Barman Cloud CNPG-I plugin is a component of the
+[CloudNativePG project](https://github.com/cloudnative-pg) and adheres to the
+same community-driven [governance](GOVERNANCE.md) model under the
+[CNCF](https://cncf.io).
+
+<p style="text-align:center;" align="center">
+      <picture align="center">
+         <source media="(prefers-color-scheme: dark)" srcset="https://github.com/cncf/artwork/blob/main/other/cncf/horizontal/white/cncf-white.svg?raw=true">
+         <source media="(prefers-color-scheme: light)" srcset="https://github.com/cncf/artwork/blob/main/other/cncf/horizontal/color/cncf-color.svg?raw=true">
+         <img align="center" src="https://github.com/cncf/artwork/blob/main/other/cncf/horizontal/color/cncf-color.svg?raw=true" alt="CNCF logo" width="50%"/>
+      </picture>
+</p>
+
+---
+
+<p align="center">
+CloudNativePG was originally built and sponsored by <a href="https://www.enterprisedb.com">EDB</a>.
+</p>
+
+<p style="text-align:center;" align="center">
+      <picture align="center">
+         <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/cloudnative-pg/.github/main/logo/edb_landscape_color_white.svg">
+         <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/cloudnative-pg/.github/main/logo/edb_landscape_color_grey.svg">
+         <img align="center" src="https://raw.githubusercontent.com/cloudnative-pg/.github/main/logo/edb_landscape_color_grey.svg" alt="EDB logo" width="25%"/>
+      </picture>
+</p>
+
+---
+
+<p align="center">
+<a href="https://www.postgresql.org/about/policies/trademarks/">Postgres, PostgreSQL, and the Slonik Logo</a>
+are trademarks or registered trademarks of the PostgreSQL Community Association
+of Canada, and used with their permission.
+</p>
+
+---

RELEASE-PROCEDURE.md

@@ -0,0 +1,10 @@
+# Release Procedure
+
+The Barman Cloud Plugin follows [Semantic Versioning](https://semver.org/) and
+uses [Conventional Commits](https://www.conventionalcommits.org/) to structure
+commit messages.
+It leverages the [Release Please](https://github.com/googleapis/release-please)
+tool to automate the release process.
+
+The only requirement is that each release must include versioned documentation.
+For more details, please refer to [web/README.md](web/README.md).