Adding dependabot changelog PR workflow

Signed-off-by: Harsha Vamsi Kalluri <[email protected]>

.github/dependabot.yml

@@ -4,4 +4,7 @@ updates:
     package-ecosystem: nuget
     schedule:
       interval: weekly
+    labels:
+      - "dependabot"
+      - "dependencies"
 version: 2

.github/workflows/dependabot_pr.yml

@@ -0,0 +1,37 @@
+name: Dependabot PR actions
+on: pull_request
+
+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/[email protected]
+        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 the changelog
+        uses: dangoslen/dependabot-changelog-helper@v1
+        with:
+          version: 'Unreleased'
+
+      - name: Commit the changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "Update changelog"
+          branch: ${{ github.head_ref }}
+          commit_user_name: dependabot[bot]
+          commit_user_email: [email protected]
+          commit_options: '--signoff'

CONTRIBUTING.md

@@ -6,7 +6,7 @@
   - [Contributing Code](#contributing-code)
 - [Developer Certificate of Origin](#developer-certificate-of-origin)
 - [Changelog](#changelog)
-  - [Adding changes](#adding-changes)
+  - [Adding Changes](#adding-changes)
 - [Review Process](#review-process)
 
 ## Contributing to OpenSearch
@@ -84,12 +84,12 @@ You may type this line on your own when writing your commit messages. However, i
 
 ## Changelog
 
-OpenSearch-Net maintains a version specific changelog by enforcing a change to the ongoing [CHANGELOG](CHANGELOG.md) file adhering to the [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format.
+OpenSearch-net maintains a version specific changelog by enforcing a change to the ongoing [CHANGELOG](CHANGELOG.md) file adhering to the [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format.
 
 The changes are curated by version, with the changes to the main branch added chronologically to the `Unreleased` version. Each version has corresponding sections which list out the category of the change - `Added`, `Changed`, `Deprecated`, `Removed`, `Fixed`, `Security`.
 
 
-### Adding changes
+### Adding Changes
 
 As a contributor, you must ensure that every pull request has its changes listed out within the corresponding version and appropriate section of the [CHANGELOG](CHANGELOG.md) file.