A bit of professionalisation (#1)

.github/workflows/dotnet.yml

@@ -0,0 +1,35 @@
+name: .NET
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 6.0.x
+    - name: Restore dependencies
+      run: dotnet restore
+    - name: Build
+      run: dotnet build --no-restore
+    - name: Test
+      run: dotnet test --no-build --verbosity normal
+    - name: Prepare .NET tools
+      run: dotnet tool restore
+    - name: Run Fantomas
+      run: ./hooks/pre-push