add clang formatter github action

.github/workflows/clang-format.yml

@@ -0,0 +1,29 @@
+name: Code Formatting
+
+on: [push]
+#   push:
+#     branches: [ master ]
+#   pull_request:
+#     branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    - name: requirements
+      run: | 
+        sudo apt -qq -y update
+        sudo apt -qq install clang-format 
+    steps:
+    - uses: actions/checkout@master
+      with:
+        submodules: true
+    - name: Formatter
+      run: find -name '*.c' -o -name '*.h' | \
+        xargs clang-format -i -style="{ BasedOnStyle: LLVM, UseTab: Never, \
+          IndentWidth: 4, TabWidth: 4, BreakBeforeBraces: Allman, \
+          AllowShortIfStatementsOnASingleLine: false, IndentCaseLabels: false, \
+          ColumnLimit: 80, AccessModifierOffset: -4 }"
+    - name: test
+      run: git diff
+