a tutorial for this project

[0xyilu]

we need to have a tutorial to briefly introduce our system and help collaborators get started

Good refernece https://github.com/ethereum/go-ethereum/wiki/Contract-Tutorial https://github.com/EOSIO/eos/wiki/Tutorials https://docs.python.org/3/tutorial/ https://reactjs.org/tutorial/tutorial.html

We will add the tutorial to our contributing guideline