Hi all,
This week I updated some details of proposal and my proposed tasks, which can be found at https://github.com/texmacs/gsoc2020. You can regard it as a tracker for developing progress.
As for converter, I made PR for incorporating tm2md into texmacs. Further discussion can be found at https://github.com/texmacs/texmacs/pull/44.
Recently I moved on developing md2tm part for markdown converter, which involves modification for C++ codes to parse markdown format as Tree.
Best Regards,