chore(CHANGELOG): initial changelog for v0.1.0

Author: Buckwich

CHANGELOG.md

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+# Changelog
+
+All notable changes to [@camunda/feel-builtins](https://github.com/camunda/feel-builtins) are documented here. We use [semantic versioning](http://semver.org/) for releases.
+
+## Unreleased
+
+___Note:__ Yet to be released changes appear here._
+
+## 0.1.0
+
+* `FEAT`: Initial release, import `camundaBuiltins` from `@bpmn-io/feel-editor`