[CCI] Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,18 @@
+### Description
+
+_Describe what this change achieves._
+
+### Issues Resolved
+
+_List any issues this PR will resolve, e.g. Closes [...]._
+
+### Check List
+
+- [ ] New functionality includes testing.
+  - [ ] All tests pass
+- [ ] Linter check was successfull - `yarn run lint` doesn't show any errors
+- [ ] Commits are signed per the DCO using --signoff
+- [ ] Changelog was updated.
+
+By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
+For more information on following Developer Certificate of Origin and signing off your commits, please check [here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

CHANGELOG.md

@@ -1,11 +1,16 @@
 # CHANGELOG
+
 Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
+
 ### Added
+
 - Add release details to releasing.md ([319](https://github.com/opensearch-project/opensearch-js/pull/319))
 - Added Amazon OpenSearch Serverless in user_guide ([#372](https://github.com/opensearch-project/opensearch-js/issues/372))
+- Added pull_request_template ([440](https://github.com/opensearch-project/opensearch-js/pull/440))
 ### Dependencies
+
 - Bumps `aws4` from 1.11.0 to 1.12.0
 - Bumps `minimist` from 1.2.6 to 1.2.8
 - Bumps `tsd` from 0.24.1 to 0.27.0
@@ -20,22 +25,31 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Bumps `deepmerge` from 4.2.2 to 4.3.0
 - Bumps `tap` from 16.3.0 to 16.3.4
 - Bumps `rimraf` from 4.1.1 to 4.4.0
+
 ### Changed
+
 - Remove test artifacts from gh_pages workflow ([#335](https://github.com/opensearch-project/opensearch-js/issues/335))
 - Make fields in `BulkOperation` optional to match OpenSearch Bulk API requirements ([#378](https://github.com/opensearch-project/opensearch-js/pull/378))
+
 ### Deprecated
+
 ### Removed
+
 - Remove waitCluster in Integration Tests ([#422](https://github.com/opensearch-project/opensearch-js/issues/422))
+
 ### Fixed
+
 - Added missing types for AwsSigv4SignerOptions.service ([#377](https://github.com/opensearch-project/opensearch-js/pull/377))
 - Fixed deprecated folder mapping "./" in the "exports" field module resolution ([#416](https://github.com/opensearch-project/opensearch-js/pull/416))
 
 ### Security
-- [CVE-2022-25912] Bumps simple-git from 3.4.0 to 3.15.0 ([#341](https://github.com/opensearch-project/opensearch-js/pull/341))
 
+- [CVE-2022-25912] Bumps simple-git from 3.4.0 to 3.15.0 ([#341](https://github.com/opensearch-project/opensearch-js/pull/341))
 
 ## [2.2]
+
 ### Added
+
 - Add release details to releasing.md ([319](https://github.com/opensearch-project/opensearch-js/pull/319))
 - Allow overriding the aws service identifier in AwsSigv4Signer ([333](https://github.com/opensearch-project/opensearch-js/pull/333))
 - Added skip-changelog label ([339](https://github.com/opensearch-project/opensearch-js/pull/339))
@@ -49,6 +63,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed typos in `ConnectionPool` ([#427](https://github.com/opensearch-project/opensearch-js/pull/427))
 
 ### Dependencies
+
 - Bumps `xmlbuilder2` from 2.4.1 to 3.0.2
 - Bumps `minimatch` from 3.0.4 to 3.1.2
 - Bumps `eslint` from 7.32.0 to 8.32.0
@@ -63,27 +78,37 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Bumps `rimraf` from 3.0.2 to 4.1.1
 
 ### Dependencies
+
 ### Changed
+
 - Remove test artifacts from gh_pages workflow ([#335](https://github.com/opensearch-project/opensearch-js/issues/335))
 
 ### Deprecated
+
 ### Removed
+
 ### Fixed
+
 ### Security
+
 - [CVE-2022-25912] Bumps simple-git from 3.4.0 to 3.15.0 ([#341](https://github.com/opensearch-project/opensearch-js/pull/341))
 
 ## [2.1]
+
 ### Added
+
 - Github workflow for changelog verification ([#306](https://github.com/opensearch-project/opensearch-js/pull/306))
 - Add GitHub and Jenkins release workflow ([#317](https://github.com/opensearch-project/opensearch-js/pull/317))
 
 ### Dependencies
+
 - Bumps `tsd` from 0.22.0 to 0.24.1
 - Bumps `semver` from 7.3.7 to 7.3.8
 
 ### Fixed
+
 - Fix mutability of connection headers ([#291](https://github.com/opensearch-project/opensearch-js/issues/291))
 
 [2.1]: https://github.com/opensearch-project/opensearch-js/releases/tag/2.1.0
 [2.2]: https://github.com/opensearch-project/opensearch-js/releases/tag/2.2.0
-[Unreleased]: https://github.com/opensearch-project/opensearch-js/compare/2.2...HEAD
+[Unreleased]: https://github.com/opensearch-project/opensearch-js/compare/2.2...HEAD