installation du backend

backend/.eslintrc.js

backend/.gitignore

backend/.prettierrc

backend/README.md

backend/nest-cli.json

backend/package-lock.json

backend/package.json

backend/src/app.controller.spec.ts

backend/src/app.controller.ts

backend/src/app.module.ts

backend/src/app.service.ts

backend/src/main.ts

backend/test/app.e2e-spec.ts

backend/test/jest-e2e.json

backend/tsconfig.build.json

backend/tsconfig.json