Create a workflow for first issue/pr.

.github/workflows/first-issue-first-pr.yml

@@ -0,0 +1,9 @@
+            - name: First interaction
+  uses: actions/first-interaction@v1.3.0
+  with:
+    # Token for the repository. Can be passed in using {{ secrets.GITHUB_TOKEN }}
+    repo-token: 
+    # Comment to post on an individual's first issue
+    issue-message: Thanks for opening your first issue! :) # optional
+    # Comment to post on an individual's first pull request
+    pr-message: Thanks for creating your first PR! :)  # optional