set up CI workflow

Author: FirstFlush

.github/workflows/ci.yml

@@ -0,0 +1,11 @@
+on: [push, pull_request]
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: 8.x
+      - run: dotnet build
+      - run: dotnet test