New IceStorm Weather demo

[bernardnormier]

This PR adds a new IceStorm demo in C#.

[Copilot]

PR Overview

This PR introduces a new IceStorm Weather demo in C#, demonstrating a simple pub‑sub system where weather sensors send periodic readings and weather stations receive and display these reports.

• Added a sensor application that publishes random weather readings via IceStorm.
• Added a station application that subscribes to the weather topic and prints received reports.
• Included supporting components such as a custom AtmosphericConditions override, a ConsolePrinter servant, and updated documentation.

Reviewed Changes

File	Description
csharp/IceStorm/Weather/Sensor/Program.cs	Implements the sensor logic that publishes weather readings.
csharp/IceStorm/Weather/Station/Program.cs	Implements the station logic that subscribes to the weather topic.
csharp/IceStorm/Weather/Station/ConsolePrinter.cs	Provides a servant that prints sensor reports to the console.
csharp/IceStorm/Weather/Station/AtmosphericConditions.cs	Adds a custom ToString method for better display of weather data.
csharp/IceStorm/Weather/README.md	Updates documentation to guide building and running the demo.

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

[pepone]

Very refreshing demo. No more clock!

[bernardnormier]

One issue with clock is while a clock "ticks", you don't send ticks with the current timestamp to your clock: the interface didn't make sense.