chore(ci): add contributors workflow (#39)

Adds nightly workflow to auto-update README contributors section

Author: CalvinAllen

.github/workflows/contributors.yml

@@ -0,0 +1,42 @@
+name: Update Contributors
+
+on:
+  schedule:
+    - cron: '0 0 * * *'  # Run daily at midnight UTC
+  workflow_dispatch:  # Allow manual trigger
+
+jobs:
+  contributors:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.CONTRIBUTORS_TOKEN }}
+
+      - name: Update contributors
+        env:
+          GH_TOKEN: ${{ secrets.CONTRIBUTORS_TOKEN }}
+        run: |
+          # Fetch contributors from GitHub API (exclude bots)
+          contributors=$(gh api repos/CodingWithCalvin/VS-GitRanger/contributors --paginate --jq '.[] | select(.type != "Bot") | select(.login | test("\\[bot\\]$") | not) | "<a href=\"\(.html_url)\"><img src=\"\(.avatar_url)\" width=\"64\" height=\"64\" alt=\"\(.login)\"/></a>"')
+
+          # Build the contributors section
+          contrib_section="<!-- readme: contributors -start -->
+          <p align=\"left\">
+          $contributors
+          </p>
+          <!-- readme: contributors -end -->"
+
+          # Update README between the markers
+          awk -v contrib="$contrib_section" '
+            /<!-- readme: contributors -start -->/{found=1; print contrib; next}
+            /<!-- readme: contributors -end -->/{found=0; next}
+            !found{print}
+          ' README.md > README.tmp && mv README.tmp README.md
+
+      - name: Commit and push
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add README.md
+          git diff --staged --quiet || (git commit -m "docs: update contributors [skip ci]" && git push)