[New Port Request] Fastor

[eessmann]

Library name:
Fastor

Library description:
Fastor is a high performance tensor (fixed multi-dimensional array) library for modern C++

Source repository URL:
https://github.com/romeric/Fastor

Project homepage (if different from the source repository):

Anything else that is useful to know when adding (such as optional features the library may have that should be included):
Fastor can optionally use the Intel MKL library to speed up computations on large tensors.