Auto detect makefile as default build

[Selyss]

It may be nice to automatically detect a makefile and use that when a language doesn't have a specific command in the options table. This feature might be a nice polish thing to add, but the user could always specify the make command in their options table anyway... only downside would be the lack of project specific make-ing, which would require the user to edit the options table on a project basis.

[trimclain]

Do you mean a similar thing to what jaq.nvim did with it's reading from json?