github: formatting: add check on push and pull-request

.gitattributes

@@ -1 +1,2 @@
-* text=auto
+* text=auto
+*.cmd text eol=crlf

.github/workflows/formatting.yml

@@ -0,0 +1,18 @@
+name: Code Formatting
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Install pre-commit
+      run: pip install pre-commit
+    - name: Run pre-commit
+      run: pre-commit run --all-files

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+    - id: check-added-large-files
+    - id: mixed-line-ending
+      args: ['--fix', 'no']
+      exclude: |
+         (?x)(
+            .*\.cmd
+         )$
+    - id: mixed-line-ending
+      args: ['--fix', 'crlf']
+      files: '\.cmd$'
+