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Write metadata for your contract

The contractmeta! macro provided in the Rust SDK allows users to write two strings - a key and a val - within a serialized SCMetaEntry::SCMetaV0 XDR object to the custom section of Wasm contracts. The section name for this metadata is contractmetav0. Developers can utilize this macro to write metadata, and tools can then read and display this information to users.

The liquidity pool example provides a clear demonstration of how to use the contractmeta! macro:

// Metadata that is added on to the Wasm custom section
key = "Description",
val = "Constant product AMM with a .3% swap fee"

pub trait LiquidityPoolTrait {...