Improve the realtime example by passing some data over the channel

This is to suggest a minor improvement to the realtime example. Currently the /examples/README.md file says it "demonstrates the use of go channels to perform realtime communication with a Bubble Tea application."

Right now a channel is in use, however no data is being passed over it, so it's not really demonstrating how to update the model with something that was passed over a channel.

Instead of just counting the number of times that no data was sent, this example could be improved if it actually passed some sort of data in the structure, and then Update() could update the model with whatever was received through the channel, and then the View() could actually show that data as successfully arrived.

Start with the realtime example referenced from /examples/README.md and inspect how its channel, Update(), and View() currently handle the absence of data. Change the example so data is sent through the channel, applied by Update(), and shown by View(); done means the example visibly demonstrates data arriving over a channel.

Written by the indexing model from the issue text.