Business Source License
The Business Source License (BSL) is a middle ground of sorts between open source and end-user licenses. The BSL (also sometimes abbreviated as BUSL) is considered a source-available license in that anyone can view or use the licensed code for internal or testing purposes, but there are limitations on commercial use.
Instructions
Create a LICENSE.md file at the root of your project, copy this file, modify it with your information, and then paste it into the newly created file at the root of your project.