CRUD for groups / GET as Observable

package.json

src/app.module.ts

src/groups/dao/groups.dao.ts

src/groups/dto/create-group.dto.ts

src/groups/dto/update-group.dto.ts

src/groups/entities/group.entity.ts

src/groups/groups.controller.ts

src/groups/groups.module.ts

src/groups/groups.service.ts

src/groups/groups.types.ts

src/groups/schemas/group.schema.ts