Drupal core includes the help module and there is also the contrib module advanced_help. These do not appear to exist in backdrop. I thought it would be useful even if all it does is provide a GUI that helps to display the readme file of modules and allows for more details.
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Interesting idea. You can put a port/new module request here:
https://github.com/backdrop-ops/contrib/issues
Someone recently ported the D7 core blog module as a contrib to help with migrations.
If it was just looking at the Readme, then could be fairly standard, but what you would need to factor in is that many README's have code snippets in; the current project listing on Backdrop doesn't handle these well so may need to look at a parser as a dependency
Thank you for the suggestion. I have gone ahead and added the port request, https://github.com/backdrop-ops/contrib/issues/726
I'm not sure of the chronology of this as there is no date on the post. But, the following post shows that the Help module was removed (or excluded) from the core of Backdrop.
https://docs.backdropcms.org/documentation/features-removed-from-core