add README to smart contracts
add README to smart contracts

linkmax91/bitquant,joequant/bitquant,joequant/bitquant,linkmax91/bitquant,joequant/bitquant,joequant/bitquant,linkmax91/bitquant,linkmax91/bitquant,linkmax91/bitquant,joequant/bitquant,linkmax91/bitquant