Add the changelog

Add the CHANGELOG.md for the release.

Change-Id: Ia6f0afaece9fca4df4dd2042e7a41fd91edd853c

CHANGELOG.md

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+# Change Log for RDC 
+Full documentation for RDC is available at [ROCm DataCenter Tool User Guide](https://docs.amd.com/bundle?name_filter.field=title&name_filter.value=ROCm%20DataCenter%20Tool%20User%20Guide&rpp=10&sort.field=title&sort.value=desc).
+
+## RDC for ROCm 5.5.0
+
+### Added
+- Added new profiling metrics for RDC dmon module.