In this change we rename 3rdparty/README.md (which contains the process
playboook for C++ dependencies) to 3rdparty/cpp-thirdparty.md and add a
new 3rdparty/py-thirdparty.md file which contains the process playbook
for python dependencies.
We also update the main 3rdparty/README.md file to serve as a
starting-point referring to both of these files.
Signed-off-by: Josh Bialkowski <1309820+cheshirekow@users.noreply.github.com>
Co-authored-by: Josh Bialkowski <1309820+cheshirekow@users.noreply.github.com>
