Create project files

.github/workflows/dotnet.yml

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+name: .NET Tests
+
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ "*" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: [6.0.x, 7.0.x, 8.0.x, 9.0.x]
+      - name: Restore dependencies
+        run: dotnet restore
+      - name: Build
+        run: dotnet build --no-restore /p:TreatWarningsAsErrors=false
+      - name: Test
+        run: dotnet test --no-build --verbosity normal