.github: Add action to run PatchCheck.py

Signed-off-by: Michael D Kinney <[email protected]>

.github/workflows/code-review.yml

@@ -0,0 +1,33 @@
+name: Code Review
+
+on:
+  pull_request:
+    branches:
+      - sandbox/master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: 0
+    - name: Run a one-line script
+      run: echo Hello, world!!!
+    - name: Run a multi-line script
+      run: |
+        echo Add other actions to build,
+        echo test, and deploy your project.
+    - name: Run git log
+      run: git log --oneline -n30
+    - name: Run dir
+      run: dir
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+        architecture: 'x64'
+    - name: PatchCheck
+      run: python BaseTools/Scripts/PatchCheck.py ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }}