Add change log

Author: huddlej

CHANGES.md

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+This is the changelog for the Nextstrain forecasts-ncov workflow.
+All notable changes in a release will be documented in this file.
+
+This changelog is intended for _humans_ and follows many of the principles from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+Changes for this project _do not_ currently follow the [Semantic Versioning rules](https://semver.org/spec/v2.0.0.html).
+Instead, changes appear below grouped by the date they were added to the workflow.
+
+# 11 August 2025
+
+ - Schedule and automate pull requests with USA model results to [the variant hub](https://github.com/reichlab/variant-nowcast-hub/). See [#144](https://github.com/nextstrain/forecasts-ncov/pull/144) for details.