Add github actions for multi-platform unit tests.

.github/workflows/deploy.yml

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+name: Deploy
+
+on: 
+  release:
+    types: release
+
+jobs:
+  deploy:
+    name: Deploy
+    needs: build_test
+    runs-on: windows-latest
+    if: ${{ false }} # not active right now
+    
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Fetch all history for all tags and branches
+        run: git fetch --prune --unshallow
+
+      - name: Install GitVersion
+        uses: gittools/actions/gitversion/setup@v0.9.2
+        with:
+            versionSpec: '5.2.x'
+
+      - name: Use GitVersion
+        id: gitversion # step id used as reference for output values
+        uses: gittools/actions/gitversion/execute@v0.9.2
+
+      - name: Setup Dotnet
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '3.1.x' # SDK Version to use; x will use the latest version of the 3.1 channel
+        
+      - name: Pack
+        if: ${{ matrix.pack }}
+        run: dotnet pack --configuration "${{ env.configuration }}" /p:Version="${{ steps.gitversion.outputs.nuGetVersion }}" -o "${{ env.artifacts }}"
+
+      - name: Upload Artifacts
+        if: ${{ matrix.pack }}
+        uses: actions/upload-artifact@v2
+        with:
+          name: NugetPackage
+          path: ${{ env.artifacts }}/**

.github/workflows/test.yml

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+name: Test
+
+on:
+  [pull_request, push]
+  
+jobs:
+
+  build_test:
+    name: test-${{ matrix.os }}-${{ matrix.test-framework }}
+    runs-on: ${{ matrix.os }}
+    env:
+      configuration: Release
+      artifacts: ${{ github.workspace }}/artifacts
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-latest]
+        test-framework: [netcoreapp3.1]
+        include:
+          - os: ubuntu-latest
+            installSnap7: true
+          - os: macos-latest
+            installSnap7: true
+          - os: windows-latest
+            test-framework: net452
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Snap7 Linux
+        if: ${{ matrix.installSnap7 && matrix.os == 'ubuntu-latest' }}
+        run: |
+          sudo add-apt-repository ppa:gijzelaar/snap7
+          sudo apt-get update
+          sudo apt-get install libsnap7-1 libsnap7-dev
+          
+      - name: Install Snap7 MacOs
+        if: ${{ matrix.installSnap7 && matrix.os == 'macos-latest' }}
+        run: |
+          brew install snap7
+
+      - name: Setup Dotnet
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '3.1.x' # SDK Version to use; x will use the latest version of the 3.1 channel
+
+      - name: Test
+        run: dotnet test --verbosity normal --logger GitHubActions --framework ${{ matrix.test-framework }}