Net Core - AppVeyor Matrix Build First Attempt

Build Net Core projects using the VS 2019 build worker image.

No custom build script yet, nuget packages are only created for our Net Full build

Issue #3197

appveyor.yml

@@ -1,4 +1,6 @@
-image: Visual Studio 2015
+image:
+  - Visual Studio 2015
+  - Visual Studio 2019
 
 version: 84.4.0-CI{build}
 
@@ -12,15 +14,31 @@ skip_commits:
     - '**/*.js'
     - '**/*.css'
     - '**/*.txt'
-
-# to run your custom scripts instead of automatic MSBuild
-build_script:
-  - ps: .\build.ps1
-
-# Test our Release x64 build
-test:
-  assemblies:
-    - CefSharp.Test\bin\x64\Release\CefSharp.Test.dll
+
+matrix:
+  fast_finish: true
+
+for:
+  -
+    matrix:
+      only:
+        - image: Visual Studio 2015
+	build_script:
+		- ps: .\build.ps1
+	test:
+		# Test our Release x64 build
+		assemblies:
+			- CefSharp.Test\bin\x64\Release\CefSharp.Test.dll
+  -
+    matrix:
+	  only:
+	    - image: Visual Studio 2019
+	build:
+	  project: CefSharp3.netcore.sln
+	test:
+		# Test our Release x64 build
+		assemblies:
+			- CefSharp.Test\bin.netcore\x64\Release\netcoreapp3.1\CefSharp.Test.dll  
 
 artifacts:
   - path: NuGet\**\*.nupkg
@@ -32,6 +50,6 @@ deploy:
   server: https://www.myget.org/F/cefsharp/api/v2/package
   api_key:
     secure: Zf7UgKf482O82zGWbbPjL+tIK9Y6R1pEHpLgoSZCfuzl4SLfjchqL1MHdlBlb4IY
-  skip_symbols: false
+  skip_symbols: true
   symbol_server: https://www.myget.org/F/cefsharp/api/v2/package
   artifact: nupkgfiles