feat: ✨ add CHANGELOG with some description of it (#178)

# Description

Adds the CHANGELOG with text about our release process.

This PR needs a quick review.

## Checklist

- [x] Ran `just run-all`
- [x] Formatted Markdown, if modified

Author: lwjohnst86

template/CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+Since we follow [Conventional
+Commits](https://decisions.seedcase-project.org/why-conventional-commits),
+we're able to automatically create a release based on the commit message
+by using
+[Commitizen](https://decisions.seedcase-project.org/why-semantic-release-with-commitizen).
+This means that releases can happen quite often, sometimes several in
+a day. It also means any individual release will not have many changes
+within it. Below is a list of releases along with what was changed
+within it.