>npm install primeng --save

import { Calendar } from 'primeng/primeng'

import { Calendar } from 'primeng/primeng'

Template pasrse errors:
'p-calendar' is not a known element:
1. If 'p-calendar' is an Angular component, then verify that it is part of this module.
2. If 'p-calendar' is a web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message ....