ci: Set-up GitHub Actions to check if a PR builds successfully

.github/workflows/pr_verify_build.yml

@@ -0,0 +1,21 @@
+name: Verify PR Builds
+
+on: pull_request
+
+jobs:
+  windows:
+    name: Windows
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        configuration: [Debug, Release]
+    steps:
+      - uses: actions/checkout@master
+      - name: Generate cmake files
+        run: |
+          git submodule update --init --recursive --force
+          mkdir build && cd build
+          cmake .. -G "Visual Studio 16 2019" -A Win32
+      - name: Build
+        run: cmake --build build/ --config ${{ matrix.configuration }}
+