Add GitHub metrics workflow

This workflow runs daily at midnight and can be triggered manually to generate GitHub metrics using the lowlighter/metrics action.

Author: GaabDevWeb

.github/workflows/main.yml

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+name: Metrics
+on:
+  schedule: [{cron: "0 0 * * *"}] # Roda todo dia à meia-noite
+  workflow_dispatch: # Permite rodar manualmente
+jobs:
+  github-metrics:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lowlighter/metrics@latest
+        with:
+          token: ${{ secrets.METRICS_TOKEN }} # Você precisará criar esse Token (PAT)
+          user: seu-usuario-github
+          template: classic
+          base: header, activity, community, repositories, metadata
+          config_timezone: America/Sao_Paulo
+          
+          # Plugins que combinam com seu estilo:
+          plugin_lines: yes # Mostra linhas de código escritas
+          plugin_habits: yes # Mostra seus horários de maior foco (estilo gráfico de sistema)
+          plugin_habits_charts: yes
+          plugin_languages: yes
+          plugin_languages_details: bytes-size, percentage
+          plugin_languages_sections: most-used