[Feature]: Document C, C++, Rust chat clients and server

[nickvidal]

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Description

For the Semester of Code, we would like to ask the students Kieran and UD to document how to the C, C++, and Rust chat clients and server work.

Acceptance Criteria

This documentation would be part of the Codex README for each implementation and also one or more tutorials over at Wasm.Builders.

Suggestions for a technical implementation

No response

[dpal]

@nickvidal semester ended. Where are we with this one?