Add GitHub workflows for generating metrics and contribution snake

.github/workflows/metrics.yml

@@ -0,0 +1,22 @@
+name: Generate GitHub Metrics
+
+on:
+  schedule:
+    - cron: "0 0 * * 0"   # Runs every Sunday
+  workflow_dispatch:       # Allow manual runs
+
+jobs:
+  github-metrics:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lowlighter/metrics@latest
+        with:
+          token: ${{ secrets.METRICS_TOKEN }}
+          user: Alvin-Zilverstand
+          template: classic
+          base: header, activity, community, repositories, metadata
+          config_timezone: Europe/Amsterdam
+
+          # 📅 Isometric commit calendar
+          plugin_isocalendar: yes
+          plugin_isocalendar_duration: full-year