Feature request: Add a rust toolchain file

[flipchan]

Hey Guys.

Could anyone add a rust-toolchain file to the examples/ dir?

It would make it easier to compile.

Example of a rust-toolchain file:

$ cat examples/rust-toolchain
[toolchain]                                   
channel = "nightly-2023-08-21"                
targets = ["wasm32-unknown-unknown"]          
profile = "default"                           
host = "x86_64-unknown-linux-gnu"