feat: add header, footer and backgound

package-lock.json

package.json

src/app/app-routing.module.ts

src/app/app.component.html

src/app/app.component.scss

src/app/app.module.ts

src/app/config/custom-breakpoint.ts

src/app/footer/footer.component.html

src/app/footer/footer.component.scss

src/app/footer/footer.component.spec.ts

src/app/footer/footer.component.ts

src/app/header/header.component.html

src/app/header/header.component.scss

src/app/header/header.component.spec.ts

src/app/header/header.component.ts

src/app/home/home.component.html

src/app/home/home.component.scss

src/app/home/home.component.spec.ts

src/app/home/home.component.ts

src/app/structure-list/structure-list.component.html