Add change log.

Signed-off-by: Archer <[email protected]>

_benchmark/change-log.md

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+---
+layout: default
+title: Change log
+nav_order: 150
+---
+
+# Change log
+
+This page gives details on any changes made between versions for OpenSearch Benchmark, starting in version 2.X.
+
+## 2.X
+
+The following benchmark components have been renamed from OpenSearch Benchmark 1.X and 2.X.
+
+
+| 1.X | 2.X	|
+| :---	| :---	|
+| execute-test | run |
+| test-execution | test-run	|
+| test-procedure | scenario	|
+| load-worker-coordinator-host	| worker-ip	|
+| results-publishing | reporting	|
+| provision_configs / provision_config_instance	| cluster_config |
+
+