insert client from terminal to file json
npm i
node app.js get --nome=[insert name]
node app.js add --nome=[insert name] --email=[insert email] --telefono=[insert phone]
node app.js del --nome=[insert name]
node app.js all --l
1 - get get client
2 - add add client
3 - del delete client
3 - all all clients
--nome --nome=[insert nome]
--email --email=[insert email]
--telefono --telefono=[insert phone]
--l only for command all