Add changelog and release process.

CHANGELOG.md

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+# Version [0.3.1.0](https://github.com/Haskell-Things/floating-bits/compare/v0.3.0.0...v0.3.1.0) (2023-12-23)
+
+ * Changelog started. Previous release was `0.3.0.0`.
+ * Fixes compatibility with GHC 9.2 and 9.4.
+ * HLint can now be run against this code successfully.
+

Release.md

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+# Release Processes:
+
+Purpose of this document: to make sure we follow a consistent pattern, when making releases of floating-bits.
+
+## Version Logic:
+1. The first digit is always 0. Maybe we'll change this when we're ready for the masses. ;)
+2. The second digit changes with "major" releases.
+ * Major releases change:
+   * the Haskell interface (in a non-additive fashion)
+3. The third digit changes with the "minor" releases.
+ * Minor releases DO NOT change:
+   * the Haskell interface (in a non-additive fashion)
+ * Minor releases may change anything else.
+4. The fourth digit changes with the "trivial" releases.
+ * Trivial releases change nothing except the documentation.
+
+
+## Tests for a Minor Release
+1. Make sure 'cabal build' succeeds.
+2. Make sure 'cabal test' succeeds.
+3. Make sure 'cabal bench' succeeds.
+
+## Performing a release
+
+### Create a Release branch
+On your git machine:
+1. Run 'git checkout -b release/<VERSION>'
+2. Update the Version field in floating-bits.cabal.
+3. Update the Version in the README.md.
+4. Change the most recent Version line in CHANGELOG.md from 'next', updating the following fields on that line.
+5. Push the branch to github, and file a pull request.
+
+### Tagging a release
+On your git machine:
+```
+export VERSION=<VERSION_NUMBER>
+git checkout master
+git tag -a v$VERSION -m "Release $VERSION"
+git push origin v$VERSION
+```
+
+### Publishing the release to GitHub
+
+1. Open Github.
+2. Click on the 'Releases' link from the code page for the implicitcad repo.
+3. Click on 'Draft a new release'
+4. Select the tag created in the previous step.
+5. Paste the CHANGELOG.md entries from this release into the release description.
+6. Title the release 'Release <versionnumber>'
+7. Click on 'Publish release'
+
+### Publishing the release to Hackage
+
+1. Use github's 'download zip' to download a zip of the package.
+2. Extract it to a temporary directory
+3. Move the container directory to floating-bits-<VERSION>
+4. Make a tar file from it. make sure to add the --format=ustar option.
+ * tar --format=ustar -cvzf floating-bits-<VERSION>.tar.gz floating-bits-<VERSION>/
+5. Upload the package candidate to https://hackage.haskell.org/packages/candidates/upload
+6. Look over the resulting page.
+7. Scroll down to 'edit package information'
+8. click on 'publish candidate'
+9. hit the 'publish package' button.