As for all other Microsoft cloud services (Azure, Office 365…) Microsoft Teams now has his own PowerShell module.
You can get it by opening a PowerShell prompt (as usual always runas Administrator) and run the command
Install-Module -Name MicrosoftTeams
If required you will need to install NuGet and trust the repository
The current version (0.9.0) allows you to perform “basic” management operations like create/remove Team or Channels, set Guest access settings or off course add/remove user to a Team.