Document release process

RELEASE.md

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+# Release process for `changelist`
+
+## Introduction
+
+Example `version`
+
+- 1.8.dev0 # development version of 1.8 (release candidate 1)
+- 1.8rc1 # 1.8 release candidate 1
+- 1.8rc2.dev0 # development version of 1.8 release candidate 2
+- 1.8 # 1.8 release
+- 1.9.dev0 # development version of 1.9 (release candidate 1)
+
+## Process
+
+- Update and review `CHANGELOG.md`:
+
+      changelist scientific-python/changelist <v0.0> main --version <0.1> >> CHANGELOG.md
+
+  where <v0.0> is the last release and <0.1> is the new one.
+
+- Update `version` in `pyproject.toml`.
+
+- Commit changes:
+
+      git add pyproject.toml CHANGELOG.md
+      git commit -m 'Designate <version> release'
+
+- Add the version number (e.g., `1.2.0`) as a tag in git:
+
+      git tag -s [-u <key-id>] v<version> -m 'signed <version> tag'
+
+  If you do not have a gpg key, use -u instead; it is important for
+  Debian packaging that the tags are annotated
+
+- Push the new meta-data to github:
+
+      git push --tags origin main
+
+  where `origin` is the name of the `github.com:scientific-python/changelist`
+  repository
+
+- Review the github release page:
+
+      https://github.com/scientific-python/changelist/tags
+
+- Publish on PyPi:
+
+      git clean -fxd
+      pip install -U build twine wheel
+      python -m build --sdist --wheel
+      twine upload -s dist/*
+
+- Update `version` in `pyproject.toml`.
+
+- Commit changes:
+
+      git add pyproject.toml
+      git commit -m 'Bump version'
+      git push origin main