Add reminder workflow for refreshing organization secrets.

Closes #32.

.github/workflows/secrets.yml

@@ -0,0 +1,18 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+name: Secrets
+on:
+    schedule:
+        - cron: 0 0 1 1 *
+    workflow_dispatch:
+permissions:
+    issues: write
+defaults:
+    run:
+        shell: bash
+jobs:
+    secrets:
+        runs-on: windows-2022
+        steps:
+            - name: Create GitHub issue
+              run: |
+                  gh issue create -R ${{ github.repository }} -t "Refresh organization secrets $(date +%Y)" -l "area: marketplace" -l "area: nuget"