add [a] AP list implementation for M0 wifi#2

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jakehlee wants to merge 7 commits intoheatseeknyc:masterfrom cseg-tech:master

Commits on Mar 1, 2019

AP list implementation for WiFi M0
jakehlee
committed

Commits on Mar 2, 2019

Commits on Oct 6, 2019

Updated README
julia-guo
committed

Commits on Nov 22, 2019

Added LTE boilerplate in transmit.cpp + user_config.h; created simple Particle project subfolder
julia-guo
committed

Commits on Dec 6, 2019

Transmit Code Added, Not compiling
ShrutiVerma17
committed

Commits on Jan 14, 2020

Revert "Updated README" and later commits to move to separate repo.
jakehlee
committed