Add CI workflow

.github/workflows/ci.yaml

@@ -0,0 +1,37 @@
+name: CI
+
+on: 
+  push:
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+
+    - name: Setup Nuget
+      uses: nuget/setup-nuget@v1
+
+    - name: Setup MSBuild # Needed by Build NativeHelper
+      uses: microsoft/setup-msbuild@v1
+
+    - name: Build NativeHelper # Need to build this separately first because nuget pack doesn't seem to handle vcxproj
+      working-directory: ./src/Helper
+      run: |
+        msbuild Helper.vcxproj /p:Configuration=Release /p:Platform=x64
+
+    - name: Nuget pack
+      working-directory: ./src
+      run: |
+        nuget restore
+        gci -Recurse -Filter *.nuspec | foreach { nuget pack "$($_.DirectoryName)\$($_.BaseName).csproj" -build -properties Configuration=Release -OutputDirectory "../bin" }
+
+    - name: Upload build
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ github.event.repository.name }}_${{ github.sha }}
+        path: bin/**/*.*