Add appveyor config

appveyor.yml

@@ -0,0 +1,26 @@
+# version format
+version: '{build}'
+
+# branches to build
+branches:
+  # whitelist
+  only:
+    - master
+
+# Do not build on tags (GitHub, Bitbucket, GitLab, Gitea)
+skip_tags: true
+
+# Maximum number of concurrent jobs for the project
+max_jobs: 1
+clone_depth: 1
+
+# Build worker image (VM template)
+build_cloud: Docker
+
+environment:
+  docker_image: node:16-alpine
+  npm_config_cache: /appveyor/projects/cache
+
+test_script:
+  - sh: |
+      npm test