This is largely done by suffixing "python" or "py" with "3".  The
README.md file is also copied here and we intend to maintain it
independently from its python2 counterpart.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

I admit this may be be a bit aggressive, but the lang
folder is getting cluttered/filled up with Python, PHP, Perl,
Ruby, etc. packages.

Makes sense to try to group them into per-lang folders.

I took the Pythons.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>