add 2.16 release note (#800)

Signed-off-by: Jackie Han <[email protected]>
(cherry picked from commit 761edd9)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-flow-framework.release-notes-2.16.0.0.md

@@ -0,0 +1,31 @@
+## Version 2.16.0.0
+
+Compatible with OpenSearch 2.16.0
+
+### Enhancements
+- Register system index descriptors through SystemIndexPlugin.getSystemIndexDescriptors ([#750](https://github.com/opensearch-project/flow-framework/pull/750))
+- Support editing of certain workflow fields on a provisioned workflow ([#757](https://github.com/opensearch-project/flow-framework/pull/757))
+- Add allow_delete parameter to Deprovision API ([#763](https://github.com/opensearch-project/flow-framework/pull/763))
+- Improve Template and WorkflowState builders ([#778](https://github.com/opensearch-project/flow-framework/pull/778))
+
+### Infrastructure
+- Update dependency com.fasterxml.jackson.core:jackson-core to v2.17.2 ([#760](https://github.com/opensearch-project/flow-framework/pull/760))
+- Update dependency gradle to v8.8 ([#725](https://github.com/opensearch-project/flow-framework/pull/725))
+- Update dependency org.junit.jupiter:junit-jupiter to v5.10.3 ([#752](https://github.com/opensearch-project/flow-framework/pull/752))
+- Update dependency org.apache.httpcomponents.core5:httpcore5 to v5.2.5 ([#754](https://github.com/opensearch-project/flow-framework/pull/754))
+- Update plugin io.github.surpsg.delta-coverage to v2.3.0 ([#772](https://github.com/opensearch-project/flow-framework/pull/772))
+- Update dependency gradle to v8.9 ([#777](https://github.com/opensearch-project/flow-framework/pull/777))
+- Update dependency org.eclipse.platform:org.eclipse.core.runtime to v3.31.100 ([#737](https://github.com/opensearch-project/flow-framework/pull/737))
+- Update plugin org.gradle.test-retry to v1.5.10 ([#784](https://github.com/opensearch-project/flow-framework/pull/784))
+- Update dependency org.apache.commons:commons-lang3 to v3.15.0 ([#791](https://github.com/opensearch-project/flow-framework/pull/791))
+
+### Maintenance
+- Change deprecated Gradle wrapper validation workflow to replacement ([#764](https://github.com/opensearch-project/flow-framework/pull/764))
+- Allow lower NodeJS version on GH runners for security test ([#765](https://github.com/opensearch-project/flow-framework/pull/765))
+- Switch diffCoverage plugin to deltaCoverage ([#762](https://github.com/opensearch-project/flow-framework/pull/762))
+- Update PULL_REQUEST_TEMPLATE to include an API spec change in the checklist ([#773](https://github.com/opensearch-project/flow-framework/pull/773))
+- Stop duplicate CI runs on branch push by bots ([#755](https://github.com/opensearch-project/flow-framework/pull/755))
+- Switch to arm64 runners on macOS ([#794](https://github.com/opensearch-project/flow-framework/pull/794))
+
+
+