Confusing README in examples C++

[Edoardo Sanguineti]

Hello,
I would like to report in this readme 
http://git.savannah.gnu.org/cgit/bison.git/tree/examples/c++/README.md 
"examples/C++/README.md" a non-existent file is mentioned. simple.yy appears to 
be missing from the directory although it is both mentioned in the readme file 
and in this web page 
https://www.gnu.org/software/bison/manual/html_node/A-Simple-C_002b_002b-Example.html.
In the webpage I linked above it seems the file should be in this directory 
"examples/c++/simple.yy". Only simple.test remains as I believe the original 
file simple.yy was replaced by variant.yy but the corresponding test file was 
not removed as well.

If this is confirmed to be an accidental removal or it is simply the case the 
README needs to be updated (and simple.test deleted) please let me know as I 
would be interested in contributing to the repository.

Thanks for the attention.

Best regards,
Edoardo