add circleci config

.circleci/config.yml

@@ -0,0 +1,15 @@
+version: 2.1 # Use version 2.1 to enable orb usage.
+
+orbs:
+  win: circleci/windows@2.2.0 # The Windows orb give you everything you need to start using the Windows executor.
+
+jobs:
+  build: # name of your job
+    executor:
+      name: win/default # executor type
+      size: "medium" # resource class, can be "medium", "large", "xlarge", "2xlarge", defaults to "medium" if not specified
+
+    steps:
+      # Commands are run in a Windows virtual machine environment
+      - checkout
+      - run: Write-Host 'Hello, Windows'