Add tip about Go packages

doc/user/project/index.md

@@ -149,3 +149,17 @@ When [renaming a user](../profile/index.md#changing-your-username),
   work after a rename, making any transition a lot smoother.
 - The redirects will be available as long as the original path is not claimed by
   another group, user or project.
+
+## Use your project as a Go package
+
+Any project can be used as a Go package including private projects in subgroups. To use packages
+hosted in private projects with the `go get` command, use a [`.netrc` file](https://ec.haxx.se/usingcurl-netrc.html)
+and a personal access token in the password field.
+
+For example:
+
+```text
+machine example.gitlab.com
+login <gitlab_user_name>
+password <personal_access_token>
+```