Datasets selection page => DONE

...pp/search-multiple/components/dataset-list.component.html

src/app/search-multiple/components/dataset-list.component.ts

...earch-multiple/components/datasets-by-projet.component.ts

...earch-multiple/components/summary-multiple.component.html

.../search-multiple/components/summary-multiple.component.ts

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

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

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

src/app/search-multiple/containers/position.component.ts

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

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

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