Create RFC Simple Tests

[webdesus]

Submit for discussion

[pczarn]

I recommend that you link directly to rich format like Rust contributors do:

https://github.com/webdesus/fs_extra/blob/RFC-Simle-Test/rfc/simplify_tests.md

[webdesus]

In personal conversation @pczarn proposed additional changes for format:

file.txt: {
   content:"data",
   modified: "2022-05-10 14:45" 
},
simple_file.txt: "data"

This format allows using meta information for file and directory. But we have problem to define what is it. This is file or directory.

My propose using slash

example:

file.txt: "data",
/dir,
/another_dir: {
    modified: "2022-05-10 14:45" 
}
another_file: "data"