For the initial version here is what I plan to code:
A single package manager entry in a suitable menu. This would open a dialog window
containing options for (inspired from msg236906).
    1. Show installed packages(freeze)
        This menu would have options to update and remove the said package.
    2. Install package 
        The user may specify an url, paste a requirements.txt type file or
        point to a requirements.txt file.
    3. Settings
       Change install directory 

    The user will be able to update/revert to a specific version.
    Incase of an error, the error message which would be have been printed to the terminal will be displayed to the user in a dialog box.

Any changes made to packages would be for the version using which IDLE was started.

Also, what do you feel about support from non-PyPI repositories like github? Do we intend to support everything pip supports or only a subset of it (say PyPI)?

For this initial version, I would like to keep cloning across versions for later version. For now these are the things I would like to get right first.