Add a reminder when contributor is new to ping all contributor bot

.github/workflows/new-contributor.yml

@@ -0,0 +1,44 @@
+name: New Contributor Action
+on: 
+    pull_request_target:
+        types:
+          - closed
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+    cancel-in-progress: true
+
+jobs:
+  ping-new-contributor:
+    if: ${{ github.event.pull_request.merged }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const creator = context.payload.sender.login
+            const opts = github.rest.issues.listForRepo.endpoint.merge({
+              ...context.issue,
+              creator,
+              state: 'all'
+            })
+            const issues = await github.paginate(opts)
+
+            for (const issue of issues) {
+              if (issue.number === context.issue.number) {
+                continue
+              }
+
+              if (issue.pull_request) {
+                return // Creator is already a contributor.
+              }
+            }
+
+            await github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `**Welcome**, new contributor!
+
+                Do remember to request someone to add you as a official contributor to our repository, if you want to of course! See the full list of contributors [here](https://markbind.org/about.html) ✨`
+            })