front end support for downloading multiple documents

src-ui/package.json

@@ -23,6 +23,7 @@
     "@ng-bootstrap/ng-bootstrap": "^8.0.0",
     "@ng-select/ng-select": "^5.0.9",
     "bootstrap": "^4.5.0",
+    "file-saver": "^2.0.5",
     "ng-bootstrap": "^1.6.3",
     "ng2-pdf-viewer": "^6.3.2",
     "ngx-cookie-service": "^10.1.1",