Post by M.S.T.O.P. in How do I open source my project?

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Add a LICENSE file to the root directory of your repository. Github has several templates you can use:

Go to the root directory of your repo on Github and click "Create new file".
Name the new file "LICENSE". If done correctly, a button labelled "Choose a license template" should appear. Click on it.
Read over the different license templates and pick the one you want to use and then click "Review and Submit".
Commit the new LICENSE file to your repo.