Add and edit group => done

client/src/app/admin/admin-routing.module.ts

.../app/admin/components/dataset/dataset-form.component.html

...rc/app/admin/components/dataset/dataset-form.component.ts

.../src/app/admin/components/group/group-form.component.html

...nt/src/app/admin/components/group/group-form.component.ts

...src/app/admin/components/group/group-table.component.html

...t/src/app/admin/components/group/group-table.component.ts

client/src/app/admin/components/group/index.ts

client/src/app/admin/components/index.ts

...pp/admin/containers/database/database-list.component.html

.../src/app/admin/containers/group/edit-group.component.html

...nt/src/app/admin/containers/group/edit-group.component.ts

.../src/app/admin/containers/group/group-list.component.html

...nt/src/app/admin/containers/group/group-list.component.ts

...t/src/app/admin/containers/group/new-group.component.html

client/src/app/admin/containers/group/new-group.component.ts

...src/app/admin/containers/settings/settings.component.html

...rc/app/admin/containers/survey/survey-list.component.html

client/src/app/metamodel/store/effects/group.effects.ts

client/src/app/metamodel/store/models/dataset.model.ts