[CI] Create doc issue workflow (opensearch-project#1515)

* [CI] Create doc issue workflow

Add workflow to create documentation issue in
https://github.com/opensearch-project/documentation-website

Update CONTRIBUTING doc on how to use.

Issue:
opensearch-project#1493

Signed-off-by: Kawika Avilla <[email protected]>

* follow up

Signed-off-by: Kawika Avilla <[email protected]>

.github/doc_issue_template.md

@@ -0,0 +1,11 @@
+**Is your feature request related to a problem?**
+A new feature has been added.
+
+**What solution would you like?**
+Document the usage of the new feature.
+
+**What alternatives have you considered?**
+N/A
+
+**Do you have any additional context?**
+See please 

.github/workflows/create_doc_issue.yml

@@ -0,0 +1,42 @@
+name: Create Documentation Issue
+on:
+  pull_request:
+    types:
+      - labeled
+env:
+  PR_NUMBER: ${{ github.event.number }}
+
+jobs:
+  create-issue:
+    if: ${{ github.event.label.name == 'needs-documentation' }}
+    runs-on: ubuntu-latest
+    name: Create Documentation Issue
+    steps:
+      - name: GitHub App token
+        id: github_app_token
+        uses: tibdex/[email protected]
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+          # opensearch-trigger-bot installation ID
+          installation_id: 22958780
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Edit the issue template
+        run: |
+          echo "https://github.com/opensearch-project/OpenSearch-Dashboards/pull/${{ env.PR_NUMBER }}." >> ./.github/doc_issue_template.md
+          
+      - name: Create Issue From File
+        id: create-issue
+        uses: peter-evans/create-issue-from-file@v4
+        with:
+          title: Add documentation related to new feature
+          content-filepath: ./.github/doc_issue_template.md
+          labels: documentation
+          repository: opensearch-project/documentation-website
+          token: ${{ steps.github_app_token.outputs.token }}
+
+      - name: Print Issue
+        run: echo "Created related documentation issue ${{ steps.create-issue.outputs.issue-number }}"

CONTRIBUTING.md

@@ -92,7 +92,7 @@ We deeply appreciate everyone who takes the time to make a contribution. We will
 
 During the PR process, expect that there will be some back-and-forth. Please try to respond to comments in a timely fashion, and if you don't wish to continue with the PR, let us know. If a PR takes too many iterations for its complexity or size, we may reject it. Additionally, if you stop responding we may close the PR as abandoned. In either case, if you feel this was done in error, please add a comment on the PR.
 
-If we accept the PR, a [maintainer](MAINTAINERS.md) will merge your change and take care of backporting it to the appropriate branches ourselves. For the backporting process, once the PR is merged a [maintainer](MAINTAINERS.md) will label it with the appropriate target branch then the backport workflow will do the rest. For example, the label `backport 1.x` label will be added to the PR that is to be backported to `1.x`. The backport branches are named in the form `backport/backport-<original PR number>-to-<base>`. These branches will be cleaned up by an auto delete workflow once the backport PR is merged.
+If we accept the PR, a [maintainer](MAINTAINERS.md) will merge your change and take care of backporting it to the appropriate branches ourselves. For the backporting process, once the PR is merged a [maintainer](MAINTAINERS.md) will label it with the appropriate target branch then the backport workflow will do the rest. For example, the `backport 1.x` label will be added to the PR that is to be backported to `1.x`. The backport branches are named in the form `backport/backport-<original PR number>-to-<base>`. These branches will be cleaned up by an auto delete workflow once the backport PR is merged. If documentation is required, a [maintainer](MAINTAINERS.md) will label the PR with the `needs-documentation` label which will then create an issue in the [Documentation Website repo](https://github.com/opensearch-project/documentation-website). Please follow-up and provide support on the documentation issue to ensure it is successfully closed.
 
 
 If we reject the PR, we will close the pull request with a comment explaining why. This decision isn't always final: if you feel we have misunderstood your intended change or otherwise think that we should reconsider then please continue the conversation with a comment on the PR and we'll do our best to address any further points you raise.