updated cloud section

docs/cloud.md

@@ -12,3 +12,53 @@ Contact Oppkey for login to our public cloud site to browse around.
 If you wish to deploy your own site, refer to code on GitHub
 repository [oppkey-ricoh360-viewer-demo-with-login](https://github.com/codetricity/oppkey-ricoh360-viewer-demo-with-login) for an example showing how to deploy to Vercel with basic authentication
 login. The repo includes an example `vercel.json` file.
+
+For the example with login, the `secrets.env` needs to contain
+the `OPPKEY_VIEWER_PASSWORD` and `OPPKEY_VIEWER_USERNAME`
+environmental variable.
+
+If you are stuck, we have a working example of the `secrets.env` file
+[here](https://github.com/codetricity/oppkey-ricoh-viewer-credentials).
+We will need to get authorization to send you the example file.
+
+```text
+OPPKEY_VIEWER_PASSWORD=ChangeMe
+OPPKEY_VIEWER_USERNAME=devuser
+SESSION_SECRET=93qBc2janrrGcwvOxIEth3RFgf31Cg0K
+CLIENT_ID=<Your unique client id from RICOH for the platform API>
+CLIENT_SECRET=<client secret for your client id for the platform API>
+PRIVATE_KEY="<long private key for the viewer>"
+```
+
+With the login example, the browser will open a sign in window.
+even when running locally.  You can change the credentials
+in the `secrets.env` file for local testing.
+
+![ login](images/cloud/login_credentials.png)
+
+We have the reference for basic authentication if people want to share the demo they
+build with their co-workers with a simple browser link.  This repository example includes deployment configuration
+to Vercel, free plan.  If you deploy to the public
+Vercel cloud, you must set the [environmental
+variables in Vercel](https://vercel.com/docs/projects/environment-variables). A free alternative to Vercel is 
+Netlify.  
+
+### example vercel.json
+
+```json
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "./index.js",
+      "use": "@vercel/node"
+    }
+  ],
+  "routes": [
+    {
+      "src": "/(.*)",
+      "dest": "/"
+    }
+  ]
+}
+```