Create CHANGELOG.md (#962)

CHANGELOG.md

@@ -0,0 +1,29 @@
+# Changelog
+
+Useful links: Docsy [releases][] & [tags][]. Jump to the [latest][] release.
+
+## 0.X.Y - next release
+
+For a list of issues targeted for the next release, see the [22Q2][] milestone.
+
+## [0.2.0][]
+
+**New**:
+
+- Official Docsy support for [Hugo modules][]. Many thanks to the dedicated and
+  patient efforts of [@deining][], who researched, experimented, and implemented
+  this feature. Thanks to [@deining][] and [@LisaFC][] for the doc updates.
+
+**Changes**:
+
+- See the [release notes][0.2.0]
+
+
+[@deining]: https://github.com/deining
+[@LisaFC]: https://github.com/LisaFC
+[0.2.0]: https://github.com/google/docsy/releases/v0.2.0
+[22Q2]: https://github.com/google/docsy/milestone/3
+[Hugo modules]: https://gohugo.io/hugo-modules/
+[latest]: https://github.com/google/docsy/releases/latest
+[releases]: https://github.com/google/docsy/releases
+[tags]: https://github.com/google/docsy/tags