Please add NLOpt

[bpanthi977]

Please add NLOpt to Quicklisp.

This system is available here: https://github.com/bpanthi977/nlopt

NLOpt provides binding to a Non-Linear Optimization library in C called NLopt. That library provides a common interface for a number of different optimization routines.

You need to have nlopt shared library installed in your system for the library to build.

For Ubuntu

apt install nlopt 

For Arch

pacman -Suy nlopt