introduces traffic workflow action

.github/workflows/record_repo_traffic.yml

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+on:
+  schedule: 
+    # runs once a week on sunday
+    - cron: "55 23 * * 0"
+  workflow_dispatch:
+
+jobs:
+  # This workflow contains a single job called "traffic"
+  traffic:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+      with:
+        ref: "traffic"
+
+    # Calculates traffic and clones and stores in CSV file
+    - name: GitHub traffic 
+      uses: sangonzal/[email protected]
+      env:
+        TRAFFIC_ACTION_TOKEN: ${{ secrets.TRAFFIC_ACTION_TOKEN }} 
+
+    # Commits files to repository
+    - name: Commit changes
+      uses: EndBug/add-and-commit@v4
+      with:
+        author_name: traffic bot
+        message: "GitHub traffic"
+        add: "./traffic/*"
+        ref: "traffic"  # commits to branch "traffic"