chore(starknet_sierra_multicompile): add description to crate (#3594)

Signed-off-by: Dori Medini <[email protected]>

crates/starknet_sierra_multicompile/Cargo.toml

@@ -4,6 +4,7 @@ license.workspace = true
 name = "starknet_sierra_multicompile"
 repository.workspace = true
 version.workspace = true
+description = "A utility crate for compiling Sierra code into CASM and / or native."
 
 [features]
 cairo_native = ["dep:cairo-native"]