Adding changelog and verifier workflow (#65)

Signed-off-by: Harsha Vamsi Kalluri <harshavamsi096@gmail.com>

.github/workflows/changelog_verifier.yml

@@ -0,0 +1,18 @@
+name: "Changelog Verifier"
+on:
+  pull_request:
+    types: [opened, edited, review_requested, synchronize, reopened, ready_for_review, labeled, unlabeled]
+
+jobs:
+  # Enforces the update of a changelog file on every pull request
+  verify-changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - uses: dangoslen/changelog-enforcer@v3
+        with:
+          skipLabels: "autocut, skip-changelog"

.github/workflows/dependabot_pr.yml

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+name: Dependabot PR Actions
+on: 
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - labeled
+      - unlabeled
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: GitHub App token
+        id: github_app_token
+        uses: tibdex/github-app-token@v1.5.0
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+          installation_id: 22958780
+
+      - name: Check out code
+        uses: actions/checkout@v2
+        with:
+          token: ${{ steps.github_app_token.outputs.token }}
+
+      - name: Update Gradle SHAs
+        run: |
+          ./gradlew updateSHAs
+
+      - name: Commit the changes
+        uses: stefanzweifel/git-auto-commit-action@v4.7.2
+        with:
+          commit_message: Updating SHAs
+          branch: ${{ github.head_ref }}
+          commit_user_name: dependabot[bot]
+          commit_user_email: support@github.com
+          commit_options: '--signoff'
+
+      - name: Update the changelog
+        uses: dangoslen/dependabot-changelog-helper@v2
+        with:
+          version: 'Unreleased'
+
+      - name: Commit the changes
+        uses: stefanzweifel/git-auto-commit-action@v4.7.2
+        with:
+          commit_message: "Update changelog"
+          branch: ${{ github.head_ref }}
+          commit_user_name: dependabot[bot]
+          commit_user_email: support@github.com
+          commit_options: '--signoff'

CHANGELOG.md

@@ -0,0 +1,14 @@
+# CHANGELOG
+Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+
+## [Unreleased]
+### Added
+- Added CHANGELOG and verifier workflow ([65](https://github.com/opensearch-project/opensearch-hadoop/pull/65))
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+
+
+[Unreleased]: https://github.com/opensearch-project/opensearch-hadoop/compare/main...HEAD