Add contact page with a first version of the contact form

src/app/core/components/contact/contact.component.html

src/app/core/components/contact/contact.component.scss

src/app/core/components/contact/contact.component.spec.ts

src/app/core/components/contact/contact.component.ts

src/app/core/components/footer/footer.component.html

src/app/core/components/index.ts

src/app/core/core-routing.module.ts

src/app/core/core.module.ts

src/app/routes.ts