Added windows build workflow

.github/workflows/windows-build.yml

@@ -0,0 +1,17 @@
+
+name: windows-build
+
+on:
+  push:
+    branches: [ main ]
+    
+  pull_request:
+    branches: [ main ]
+    
+jobs:
+  windows-build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: make
+      run: mingw32-make