chore: add all contributors

.all-contributorsrc

@@ -0,0 +1,7 @@
+{
+  "badgeTemplate": "\t<a href=\"#contributors\" target=\"_blank\"><img alt=\"👪 All Contributors: <%= contributors.length %>\" src=\"https://img.shields.io/badge/%F0%9F%91%AA_all_contributors-<%= contributors.length %>-21bb42.svg\" /></a>",
+  "commit": false,
+  "commitConvention": "angular",
+  "commitType": "docs",
+  "contributors": []
+}

.github/workflows/contributors.yml

@@ -0,0 +1,20 @@
+# thank you @joshuakgoldberg
+# https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/workflows/contributors.yml
+jobs:
+  contributors:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/prepare
+      - env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+        uses: JoshuaKGoldberg/all-contributors-auto-action@v0.5.0
+
+name: Contributors
+
+on:
+  push:
+    branches:
+      - main