Update appveyor.yml

appveyor.yml

@@ -10,11 +10,17 @@ environment:
   OlwBloggerClientId: 597389294595-271ukaucs8ghmc6c6cnhrbef2c02g5qa.apps.googleusercontent.com
   OlwBloggerClientSecret:
     secure: ym7cbPINJz58iEgVlQCDbRz2W1CTYnxWsvMpMvxHFY4=
+  SignClientSecret:
+    secure: CHm+63iqVR0ddIHjGwE8nYF2EdUikH5VzCcszekUwptHkCLTuJ3C9ci8fcyox03s
 nuget:
   disable_publish_on_pr: true
 build_script:
 - cmd: ./build.cmd
 test: off
+install:
+  - cmd: nuget install SignClient -Version 0.7.0 -SolutionDir %APPVEYOR_BUILD_FOLDER% -Verbosity quiet -ExcludeVersion
+after_build:
+  - ps: '.\SignClient\Sign-Package.ps1'  
 artifacts:
 - path: releases\*
   name: Setup