Add overview component to search multiple result page component => DONE

src/app/search-multiple/components/index.ts

.../search-multiple/components/result/overview.component.css

...search-multiple/components/result/overview.component.html

...rch-multiple/components/result/overview.component.spec.ts

...p/search-multiple/components/result/overview.component.ts

...ltiple/components/result/reminder-multiple.component.html

src/app/search-multiple/containers/datasets.component.html

...search-multiple/containers/result-multiple.component.html

...p/search-multiple/containers/result-multiple.component.ts

src/app/search-multiple/store/model/dataset-count.model.ts

src/app/search-multiple/store/model/index.ts

src/app/search-multiple/store/search-multiple.action.ts

src/app/search-multiple/store/search-multiple.effects.ts

src/app/search-multiple/store/search-multiple.reducer.ts

src/app/search-multiple/store/search-multiple.selector.ts

src/app/search-multiple/store/search-multiple.service.ts

src/app/search/store/search.service.ts