espidf_c_ntshell

ntshell as an esp-idf component (currently arduino port only, can be used without arduino core as well

Thanks to:

Natural Tiny Shell (NT-Shell) : https://www.cubeatsystems.com/ntshell/index.html credits: Shinichiro Nakamura (CuBeatSystems)

ABShell for ArduBoy, based on arduino core and ntshell : https://github.com/boochow/abshell credits: boochow