Added an appveyor pipeline configure file to allow for a side by side build of both the windows and linux application.

appveyor.yml

@@ -0,0 +1,8 @@
+version: 1.0.{build}
+image:
+- Visual Studio 2019
+- Ubuntu2004
+  #- Ubuntu1804
+build_script:
+- cmd: msbuild "./vc/vc14_fceux.sln"
+- sh: ./pipelines/linux_build.sh

azure-pipelines.yml

@@ -12,5 +12,5 @@ pool:
 
 steps:
 - script: |
-    ./azure/linux_build.sh
+    ./pipelines/linux_build.sh
   displayName: 'make'