add release docs and changelog.adoc

dev/docs/release.adoc

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+= How to release
+
+Tapir releases use [semantic versioning](https://semver.org/).
+
+== Bump version
+
+- set the version in `pom.xml`
+- set the version in `src/main/resources/application.yml`
+- set the version in `src/main/webui/package.json`
+- set the version in `src/main/webui/src/components/Footer.tsx`
+- update test snapshots
+
+== Publish
+- update the changelog
+- Draft a new release on GitHub

src/changelog.adoc

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+== Changelog
+
+All notable changes to this project will be documented in this file
+
+The format is based on https://keepachangelog.com/en/1.0.0/[Keep a Changelog],
+and this project adheres to https://semver.org/spec/v2.0.0.html[semantic versioning].
+
+== Unreleased
+
+=== fixes
+
+=== added
+
+=== changed