Add CI (#9)

.github/workflows/build.yaml

@@ -0,0 +1,17 @@
+name: GitHub CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Add msbuild to PATH
+      uses: microsoft/[email protected]
+
+    - name: Build
+      run: msbuild -v:m -m -r -t:Build -p:Configuration=Release