Add development guidelines describing release process

DEVELOPMENT.md

@@ -0,0 +1,19 @@
+# Development Guidelines
+
+## Release Process
+
+Prepare the release (any contributor):
+
+- [ ] _Merge the changes_. All changes must be merged into `master` so that they can have stable commit IDs, which can be referenced from the Changelog.
+- [ ] _Determine the next version number_.  Follow the [Semantic Versioning](https://semver.org/) standard to determine the `$NEXT_VERSION` number.
+- [ ] _Prepare the Changelog_. Create a new `CHANGELOG.md` section following [Common Changelog](https://common-changelog.org/). Don't hard wrap lines as it is less readable in plaintext. Remember to add the Github Release link at the bottom.
+
+Make the release (maintainers only):
+
+- [ ] _Bump the version_. Run `hatch version $NEXT_VERSION` to bump the version. Commit the changes with `$NEXT_VERSION` as the commit message.
+- [ ] _Tag the version commit_. Tag this version bump Git commit with the version number: `git tag $NEXT_VERSION master`.
+- [ ] _Push the tag_. As Git tags are not pushed by default, it needs an explicit push: `git push origin $NEXT_VERSION`.
+- [ ] _Build the release artifacts_. Build in a clean environment by recreating it with `hatch env prune`. Then `hatch build --clean`.
+- [ ] _Publish to PyPI_. Push the release artifacts to the [Python Package Index](https://pypi.org/) with `hatch publish`.
+- [ ] _Create the Github Release_. [Create a new Github Release](https://github.com/autonity/autonity.py/releases/new). When completing the form, select the `$NEXT_VERSION` tag, add relevant content from the `CHANGELOG.md` entry, and mark this as the "latest release".
+- [ ] _Announce the release_. Notify relevant chat and social channels about the release. Reach out to community managers to promote it.

README.md

@@ -9,6 +9,8 @@ This package provides typed wrappers around the Autonity-specific extensions of
 Ethereum, using the [Web3.py](https://github.com/ethereum/web3.py) framework,
 for convenient and statically checked interactions with the Autonity network.
 
+This package follows [Semantic Versioning](https://semver.org/).
+
 ## Installation
 
 ```console