Add automatic static files generation and publishing using AppVeyor

appveyor.yml

@@ -0,0 +1,30 @@
+environment:
+  op_build_user: "OpenIddict Bot"
+  op_build_user_email: "32257313+openiddict-bot@users.noreply.github.com"
+  access_token:
+    secure: YusB3g3MzZkV+HZr30L99yz+LgFJkN9cJrxHhvZpjThKGFJMZHO2TpXxWsdgi+7L
+
+build_script:
+  - ps: |
+        nuget install docfx.console -Version 2.24.0
+        docfx.console.2.24.0\tools\docfx docfx.json
+        if ($lastexitcode -ne 0)
+        {
+            throw [System.Exception] "docfx build failed with exit code $lastexitcode."
+        }
+
+after_build:
+  - ps: |
+        if(-Not $env:APPVEYOR_PULL_REQUEST_TITLE)
+        {
+            git config --global credential.helper store
+            Add-Content "$env:USERPROFILE\.git-credentials" "https://$($env:access_token):x-oauth-basic@github.com`n"
+            git config --global user.email $env:op_build_user_email
+            git config --global user.name $env:op_build_user
+            git clone https://github.com/openiddict/openiddict-documentation.git -b gh-pages origin_site -q
+            Copy-Item origin_site/.git _site -recurse
+            CD _site
+            git add -A 2>&1
+            git commit -m "Update the documentation pages" -q
+            git push origin gh-pages -q
+        }

docfx.json

@@ -7,6 +7,7 @@
           "**/*.yml"
         ],
         "exclude": [
+          "appveyor.yml",
           "obj/**",
           "_site/**"
         ]