add a changelog w/ release notes

Signed-off-by: Ashish Amarnath <[email protected]>

Author: ashish-amarnath

CHANGELOG-1.4.md

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+# Changelog since v1.3.0
+
+## New Features
+
+- Adds ability to discover and import existing on-disk tarballs as snapshots. ([#161](https://github.com/kubernetes-csi/csi-driver-host-path/pull/161), [@ashish-amarnath](https://github.com/ashish-amarnath))
+
+## Bug Fixes
+
+## Other Notable Changes