Improved documentation for basic access authentication for libraries

docs/en/manuals/libraries.md

@@ -31,10 +31,26 @@ Libraries are referred to via a standard URL. For a project hosted on GitHub it
 It is recommend to always depend on a specific release of a library project instead of on the master branch. This way it is up to you as a developer to decide when to incorporate changes from a library project as opposed to always getting the latest (and potentially breaking) changes from the master branch of a library project.
 :::
 
+
+### Basic access authentication
+
+It is possible to add a username and password/token to the library URL to perform basic access authentication when using libraries that are not publicly available:
+
+```
+https://username:[email protected]/defold/private/archive/main.zip
+```
+
+The `username` and `password` fields will be extracted and added as an `Authorization` request header. This works for any server which supports basic access authorization. It can also be used to fetch libraries from private repositories hosted on GitHub. In the case of GitHub you need to [generate a personal access token](https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/creating-a-personal-access-token) and use that as your password.
+
+```
+https://github-username:[email protected]/defold/private/archive/main.zip
+```
+
 ::: important
-Note that you need read access to the Library URL. For GitHub projects, that means that the project has to be either public or that you have generated an access token.
+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!
 :::
 
+
 ## Setting up library dependencies
 
 Open the project that you would like to access the library from. In the project settings, add the Library URL to the *dependencies* property. You can specify multiple dependent projects if you want. Just add them one by one using the `+` button and remove using the `-` button: