Add Windows to the mix (#49)

dist/install-otp.ps1

@@ -0,0 +1,19 @@
+param([Parameter(Mandatory=$true)][string]$VSN)
+
+$ErrorActionPreference="Stop"
+
+Set-Location $Env:RUNNER_TEMP
+
+$FILE_OUTPUT="otp.exe"
+$DIR_FOR_BIN=".setup-beam/otp"
+
+Remove-Item -Recurse -Force "$DIR_FOR_BIN" -ErrorAction SilentlyContinue
+$ProgressPreference="SilentlyContinue"
+Invoke-WebRequest "https://github.com/erlang/otp/releases/download/OTP-$VSN/otp_win64_$VSN.exe" -OutFile "$FILE_OUTPUT"
+$ProgressPreference="Continue"
+New-Item "$DIR_FOR_BIN" -ItemType Directory | Out-Null
+Move-Item "$FILE_OUTPUT" "$DIR_FOR_BIN"
+Start-Process "./$DIR_FOR_BIN/$FILE_OUTPUT" /S -Wait
+Write-Output "C:/Program Files/erl-$VSN/bin" | Out-File -FilePath $Env:GITHUB_PATH -Encoding utf8 -Append
+Write-Output "Installed Erlang/OTP version follows"
+& "C:/Program Files/erl-$VSN/bin/erl.exe" "+V" | Write-Output