Publish schemy.repl.exe as dotnet global tool

[vivainio]

Currently, the repl is just under examples.

It would be useful to expose it as dotnet global tool, so it would be easy to "play with" the scripts while learning and testing stuff.

If this does not seem to be in scope, I can publish a global tool myself but I'm not sure how to make it obvious from the name that it's not "official" repl in any way.

[johnwcowan]

It would also be good to make it downloadable as a standalone executable from somewhere. I am primarily interested in Scheme varieties, and would prefer not to have to compile from source if possible.