Start changelog

Signed-off-by: Michael Bridgen <michael@weave.works>

CHANGELOG.md

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+# Changelog
+
+## 0.1.0
+
+**Release date:** 2020-12-10
+
+This is the first _prerelease_ of image-automation-controller and its
+API. The controller watches ImagePolicy objects (as in the
+[image-reflector-controller API][imagev1]) and commits updates to
+files in git when the "latest image" changes.
+
+The controller and API conform to the GitOps Toolkit conventions, and
+will work with the `flux` CLI, and dashboards using the standard
+metrics, and so on.
+
+This release supports:
+
+ - updating YAML files with image refs, names or tags according to
+   [markers you add][marker-example] in the YAML.
+ - supplying a custom commit message
+
+[marker-example]: https://github.com/fluxcd/image-automation-controller#adding-a-marker-to-the-yaml-to-update