Add changelog

Signed-off-by: divyansh42 <diagrawa@redhat.com>

Author: divyansh42

CHANGELOG.md

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+# openshift-actions-runner-installer Changelog
+
+## v1.1
+- Update action to run on Node16. https://github.blog/changelog/2022-05-20-actions-can-now-run-in-a-node-js-16-runtime/
+
+## v1.0
+Initial marketplace release