Add basic nuget deploy support

appveyor.yml

@@ -2,7 +2,5 @@ clone_depth: 1
 version: '{branch}-{build}'
 image: Previous Visual Studio 2017
 test: off
-install:
-  - cmd: git submodule update --init --recursive --depth=5
 build_script:
   - cmd: PowerShell -Version 2.0 .\build.ps1

appveyor_deploy.yml

@@ -0,0 +1,10 @@
+clone_depth: 1
+version: '{build}'
+image: Previous Visual Studio 2017
+test: off
+skip_non_tags: true
+build_script:
+  - cmd: PowerShell -Version 2.0 .\build.ps1
+deploy:
+  - provider: Environment
+    name: nuget