Install Openssl for Windows (#12)

Author: chapeupreto

.github/workflows/test.yml

@@ -58,6 +58,10 @@ jobs:
       matrix:
         os: [macos-latest, windows-latest]
     steps:
+      - run: echo "VCPKG_ROOT=$env:VCPKG_INSTALLATION_ROOT" | Out-File -FilePath $env:GITHUB_ENV -Append
+        if: runner.os == 'Windows'
+      - run: vcpkg install openssl:x64-windows-static-md
+        if: runner.os == 'Windows'
       - uses: actions/checkout@v3
         with:
           submodules: true