chore: add first time contributor action (#6)

Author: jovnc

.github/workflows/first-time-contributor.yml

@@ -0,0 +1,13 @@
+name: First-time contributor reminder
+
+on:
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  remind:
+    uses: git-mastery/actions/.github/workflows/first-time-contributor.yml@main
+    secrets: inherit