Sysinfo.txt is generated by unity if occurs any crashes. The content consist of users system information, running process etc. I don't think that should be shared with others.
Unity only generates project files in the top-level directory.
However, the current .gitignore will ignore all project files even
if they were not generated by Unity.
It is sometimes necessary to include non-Unity project files for
level editors or other utility projects that have been added to the
repository.
ahmyi
Borders, Casey
Jephir
Álison Fernandes
Jakub Stasiak