docs: update jsdoc license/samples-README (#233)

asset/snippets/README.md

@@ -26,6 +26,12 @@
 Before running the samples, make sure you've followed the steps outlined in
 [Using the client library](https://github.com/googleapis/nodejs-asset#using-the-client-library).
 
+`cd samples`
+
+`npm install`
+
+`cd ..`
+
 ## Samples
 
 
@@ -183,4 +189,4 @@ __Usage:__
 
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [shell_link]: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-asset&page=editor&open_in_editor=samples/README.md
-[product-docs]: https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview
+[product-docs]: https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview