Added Private Libraries in Larger Teams (#157)

* Added Private Libraries in Larger Teams

The basic access authentication will allow anyone with repo access to access all other repositories of the user through the token.  Larger teams will have members who work on multiple unconnected projects and cannot (contractually) give access to their other repositories like this.  I would like to credit "dapetcu21" for this solution, although I am not sure what the Defold Organisation's normal procedure for doing that would be.

* Changed github and Github to Gub and contribution

docs/en/manuals/libraries.md

@@ -50,6 +50,25 @@ https://github-username:[email protected]/defold/private/archive/
 Make sure to not share or accidentally leak your generated personal access token or password as it can have dire consequences if they fall into the wrong hands!
 :::
 
+### Advanced access authentication
+
+When using the basic access authentication a user's access token and username will be shared on any repository used for the project.  With a greater than 1 man team this can be an issue. To solve this issue a "read only" user needs to be used for library access to the repository, on GitHub this requires an organisation, a team and a user who doesn't need to edit the repo (hence read only).
+
+GitHub Steps:
+* [Create an organisation](https://docs.github.com/en/github/setting-up-and-managing-organizations-and-teams/creating-a-new-organization-from-scratch)
+* [Create a team within the organisation](https://docs.github.com/en/github/setting-up-and-managing-organizations-and-teams/creating-a-team)
+* [Transfer the desired private repository to your organisation](https://docs.github.com/en/github/administering-a-repository/transferring-a-repository)
+* [Give the team "read only" access to the repository](https://docs.github.com/en/github/setting-up-and-managing-organizations-and-teams/managing-team-access-to-an-organization-repository)
+* [Create or select a user to be part of this team](https://docs.github.com/en/github/setting-up-and-managing-organizations-and-teams/organizing-members-into-teams)
+* Use the "basic access authentication" above to create a personal access token for this user
+
+At this point the new user's authentication details can be committed and pushed to the repository.  This will allow anyone working with your private repository to fetch it as a library without having edit permissions to the library itself.
+
+::: important
+The read only user's token is fully accessible to anyone who can access the game repositories that are using the library.
+:::
+
+This solution was proposed on the Defold forum and [discussed in this thread](https://forum.defold.com/t/private-github-for-library-solved/67240).
 
 ## Setting up library dependencies