adds appveyor

appveyor.yml

@@ -0,0 +1,29 @@
+version: 1.0.{build}
+image: Visual Studio 2019
+
+build_script:
+  - call dev_scripts\install_dependencies.cmd
+  - call dev_scripts\build_game.cmd
+  - call dev_scripts\package_game.cmd
+
+artifacts:
+- path: dev_scripts\DIST\controlz_demo_linux.tar.gz
+  name: controlz_demo_linux.tar.gz
+- path: dev_scripts\DIST\controlz_demo_windows.zip
+  name: controlz_demo_windows.zip
+- path: dev_scripts\DIST\controlz.scm
+  name: controlz.scm
+- path: package.json
+  name: package.json
+
+deploy:
+- provider: GitHub
+  auth_token:
+    secure: wZdCrU9dcec59hLKrRi7G6N4mWamWoDHcGTe4T2P5YJsV7CEYCyEcDwulO0V3bzK
+  artifact: controlz.scm, controlz_demo_linux.tar.gz, controlz_demo_windows.zip, package.json
+  draft: false
+  prerelease: false
+  force_update: true          # it can't edit a release artifact if this is false
+  on:
+    branch: main              # release from main branch only
+    appveyor_repo_tag: true   # deploy on tag push only