Build on Linux and Windows.

Author: bgrainger

.github/workflows/dotnet.yml

@@ -5,8 +5,12 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
-    
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
     steps:
     - uses: actions/checkout@v1
     - name: Setup .NET Core