feat(post) : init card news + fix services

src/app/post/components/post-card/post-card.component.html

src/app/post/components/post-card/post-card.component.scss

...app/post/components/post-card/post-card.component.spec.ts

src/app/post/components/post-card/post-card.component.ts

src/app/post/components/post-list/post-list.component.html

src/app/post/components/post-list/post-list.component.scss

src/app/post/components/post-list/post-list.component.ts

src/app/post/post.module.ts

src/app/post/services/post.service.spec.ts

src/app/post/services/post.service.ts

src/app/post/services/post/post.component.html