Add changelog

Signed-off-by: Christopher Crone <christopher.crone@docker.com>

CHANGELOG.md

@@ -0,0 +1,37 @@
+# Changelog
+
+<!-- TEMPLATE
+## x.y.z - YYYY-MM-DD
+
+Release headlines
+
+### Added
+*
+
+### Changed
+*
+
+### Removed
+*
+
+### Fixed
+*
+
+### Known issues
+*
+
+[Release diff](https://github.com/docker/api/compare/<LAST TAG>...<THIS TAG>)
+-->
+
+## 0.1.z - 2020-06-DD
+
+First public release beta of the Docker CLI with
+[ACI](https://azure.microsoft.com/en-us/services/container-instances/)
+integration!
+
+This release includes:
+* Initial support for deploying containers to Azure Container Instances (ACI)
+* A gRPC API for managing contexts and containers
+
+### Known issues
+*