[CONFIG] .NET C# code style lint/test added in Github Actions.

Author: Gonzalo Diaz

.github/workflows/dotnet.yml

@@ -31,5 +31,7 @@ jobs:
       run: dotnet restore
     - name: Build
       run: dotnet build --no-restore
+    - name: Lint (codestyle)
+      run: dotnet format --verify-no-changes --verbosity normal
     - name: Test
       run: dotnet test --no-build --verbosity normal