ENH: Include clang format linter from ITKModuleTemplate

This GitHub Action will test if changes made are of the correct clang format. If it fails, the required changes will be printed to the screen. If it passes, then no additional changes need to be made.

Author: mseng10

.github/workflows/clang-format-linter.yml

@@ -0,0 +1,13 @@
+name: clang-format linter
+
+on: [push,pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+    - uses: InsightSoftwareConsortium/ITKClangFormatLinterAction@master