Add project files.

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: Build
+
+on:
+  push:
+    branches: ["master", "release-v*"]
+    paths-ignore:
+      - "docs/**"
+  pull_request:
+    paths-ignore:
+      - "docs/**"
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "9.0.x"
+      - name: Build
+        run: dotnet build --configuration Release