CI: add GitHubActions workflow

Author: webwarrior-ws

.github/workflows/CI.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  buildAndTest:
+
+    runs-on:
+    - windows-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 8.0.415
+    - name: Build & Run Tests
+      run: |
+        .\build.cmd