Add-DBADbRolemember,dbatools

The below command will create a new user at database level and add that user to the required roles. 
cls
$UserName='UserNameHere'
$InstanceName='InstanceNameHere'
New-DbaDbUser -SqlInstance $InstanceName -Database DatbaseNameHere -Username $UserName 
Add-DbaDbRoleMember -SqlInstance $InstanceName `
 -Database DatabaseNameHere `
 -Role "db_ddladmin","db_executor","db_datawriter","db_datareader","db_spexec" `
 -User $UserName -Verbose

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