Add release process documentation

RELEASE.md

@@ -0,0 +1,59 @@
+# Release process for `nx-parallel`
+
+## Introduction
+
+Example `version number`
+
+- 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
+
+- Set release variables:
+
+      export VERSION=<version number>
+      export PREVIOUS=<previous version number>
+      export ORG="networkx"
+      export REPO="nx-parallel"
+
+- Autogenerate release notes
+
+      changelist ${ORG}/${REPO} v${PREVIOUS} main --version ${VERSION}
+
+- Put the output of the above command at the top of `CHANGELOG.md`
+
+- Update `__version__` in `nx_parallel/__init__.py`.
+
+- Commit changes:
+
+      git add nx_parallel/__init__.py CHANGELOG.md
+      git commit -m "Designate ${VERSION} release"
+
+- Tag the release in git:
+
+      git tag -s v${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:networkx/nx-parallel`
+  repository
+
+- Review the github release page:
+
+      https://github.com/networkx/nx-parallel/tags
+
+- Update `__version__` in `nx_parallel/__init__.py`.
+
+- Commit changes:
+
+      git add pyproject.toml
+      git commit -m 'Bump version'
+      git push origin main