👷‍♂️ Add DocFX CI

.github/workflows/docfx.yml

@@ -0,0 +1,25 @@
+name: DocFX
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 3.1.101
+    - name: Install DocFX
+      run: |
+        curl -L https://github.com/dotnet/docfx/releases/latest/download/docfx.zip -o docfx.zip
+        unzip -d .docfx docfx.zip
+    - name: Build documentation
+      run: dotnet run .docfx/docfx.exe