Add new Windows event log source via Chef.

default.rb

# Note: You may want to change 'Application' in here, or make it more general,
# if you're wanting your data sources to be put somewhere else.

powershell_script 'Custom Event Log' do
  code "new-eventlog -logname Application -source '#{name}'"
  guard_interpreter :powershell_script
  not_if "[System.Diagnostics.EventLog]::SourceExists('#{name}')"
end