npm i -g @nestjs/cli
nest --version
nest new intro-nest
cd intro-nest
nest g controller books
nest g service books
npm run start:dev
npm install --save @nestjs/mongoose mongoose
npm i -g @nestjs/cli
nest --version
nest new intro-nest
cd intro-nest
nest g controller books
nest g service books
npm run start:dev
npm install --save @nestjs/mongoose mongoose