XpulpNN march

[Ahenett]

Hello,
The README states:
For both library are strictly required to have:
* pulp-sdk on Linux-based machine. If you have not done yet, please refer to its README for the right installation on your machine;
* pulp-toolchain on the same machine. If you have not done yet, please refer to its README for the right installation on your machine;
https://github.com/pulp-platform/pulp-sdkslope game
https://github.com/pulp-platform/pulp-ri...-toolchain

Thank you!