Add workflow to auto-add issues to project

Issues opened in this repository must currently be added to the org
project board by hand. Add a caller workflow that invokes the shared
PhilanthropyDataCommons/.github reusable workflow so new issues are
added to the board automatically.

Issue PhilanthropyDataCommons/.github#5 Automatically add issues to current project

Author: slifty

.github/workflows/add-to-project.yml

@@ -0,0 +1,10 @@
+name: Add to project
+
+on:
+  issues:
+    types: [opened, transferred, reopened]
+
+jobs:
+  add-to-project:
+    uses: PhilanthropyDataCommons/.github/.github/workflows/add-to-project.yml@main
+    secrets: inherit