Write messages to a log file in CMTrace.exe compatible format or Legacy text file format.
    Write-Log [-Message] <String[]> [[-Severity] <Int16>] [[-Source] <String>] [[-ScriptSection] <String>] [[-LogType] <String>] [[-LogFileDirectory] <String>] [[-LogFileName] <String>] 
    [[-MaxLogFileSizeMB] <Decimal>] [[-WriteHost] <Boolean>] [[-ContinueOnError] <Boolean>] [[-PassThru]] [[-DebugMessage]] [[-LogDebugMessage] <Boolean>] [<CommonParameters>]
    Write messages to a log file in CMTrace.exe compatible format or Legacy text file format and optionally display in the console.
    -Message <String[]>
        The message to write to the log file or output to the console.
    -Severity <Int16>
        Defines message type. When writing to console or CMTrace.exe log format, it allows highlighting of message type.
        Options: 1 = Information (default), 2 = Warning (highlighted in yellow), 3 = Error (highlighted in red)
    -Source <String>
        The source of the message being logged.
    -ScriptSection <String>
        The heading for the portion of the script that is being executed. Default is: $script:installPhase.
    -LogType <String>
        Choose whether to write a CMTrace.exe compatible log file or a Legacy text log file.
    -LogFileDirectory <String>
        Set the directory where the log file will be saved.
    -LogFileName <String>
        Set the name of the log file.
    -MaxLogFileSizeMB <Decimal>
        Maximum file size limit for log file in megabytes (MB). Default is 10 MB.
    -WriteHost <Boolean>
        Write the log message to the console.
    -ContinueOnError <Boolean>
        Suppress writing log message to console on failure to write message to log file. Default is: $true.
    -PassThru [<SwitchParameter>]
        Return the message that was passed to the function
    -DebugMessage [<SwitchParameter>]
        Specifies that the message is a debug message. Debug messages only get logged if -LogDebugMessage is set to $true.
    -LogDebugMessage <Boolean>
        Debug messages only get logged if this parameter is set to $true in the config XML file.
        This cmdlet supports the common parameters: Verbose, Debug,
        ErrorAction, ErrorVariable, WarningAction, WarningVariable,
        OutBuffer, PipelineVariable, and OutVariable. For more information, see 
        about_CommonParameters (https:/go.microsoft.com/fwlink/?LinkID=113216). 
    -------------------------- EXAMPLE 1 --------------------------
    PS C:\>Write-Log -Message "Installing patch MS15-031" -Source 'Add-Patch' -LogType 'CMTrace'
    -------------------------- EXAMPLE 2 --------------------------
    PS C:\>Write-Log -Message "Script is running on Windows 8" -Source 'Test-ValidOS' -LogType 'Legacy'
    To see the examples, type: "get-help Write-Log -examples".
    For more information, type: "get-help Write-Log -detailed".
    For technical information, type: "get-help Write-Log -full".
    For online help, type: "get-help Write-Log -online"