Add sample server repo link to docs

[martinprobson]

Hello, I spent a bit of time understanding the library and putting together a sample project that uses the default server metrics and publishes them to a Grafana dashboard.

I thought this might be generally useful to people looking for information on how to use this library, so I have included a link to the example project in the docs.

Please feel free to use as is or clone the whole repo if you want.

[rossabaker]

I'm sorry it took me so long to see this! I get overwhelmed with GitHub notifications and sometimes miss the important ones.

This is excellent work. I think it would be wonderful to fold this into documentation in this repo somehow, but this is a great first step in its current form. Thank you so much!

[rossabaker]

Random thoughts: most existing docs tooling is geared toward examples that can be compiled and run inline (e.g., mdoc; formerly, tut). We don't have anything so obvious for full Docker setups. Maybe a separate repo really is the best way. 🤔