github action to auto format source code per cpplint standard

.github/workflows/clang-format.yml

@@ -0,0 +1,39 @@
+name: Code Formatting
+
+on: [push]
+#   push:
+#     branches: [ master ]
+#   pull_request:
+#     branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: requirements
+        run: | 
+          sudo apt -qq -y update
+          sudo apt -qq install clang-format 
+      - uses: actions/checkout@master
+        with:
+          submodules: true
+      - name: Formatter
+        run: |
+          for fname in $(find . -name '*.cpp' -o -name '*.h')
+          do 
+            clang-format --verbose -i --style="$line1 $line2 $line3 $line4" "$fname"
+          done
+        env:
+          line1: "{ BasedOnStyle: Google, UseTab: Never,"
+          line2: "IndentWidth: 4, TabWidth: 4, BreakBeforeBraces: Allman,"
+          line3: "AllowShortIfStatementsOnASingleLine: false, IndentCaseLabels: false,"
+          line4: "ColumnLimit: 80, AccessModifierOffset: -4 }"
+      - name: Commit files
+        run: |
+          cp -rp ./build/html/* . && rm -rf ./build && ls -lah
+          git config --global user.name github-actions
+          git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
+          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
+          git commit -am "formatting source-code for $GITHUB_SHA" ||  true
+          git push
+