Add xbuild config to template

template/Cargo.toml

@@ -4,6 +4,12 @@ version = "0.1.0"
 authors = ["[your_name] <[your_email]>"]
 edition = "2018"
 
+# Configuration for `cargo-xbuild`, used by [`cargo-contract`](https://github.com/paritytech/cargo-contract)
+[package.metadata.cargo-xbuild]
+# Prevents panic strings and formatting code from `core` being included in final binary
+# See https://github.com/johnthagen/min-sized-rust#remove-panic-string-formatting-with-panic_immediate_abort
+panic_immediate_abort = true
+
 [dependencies]
 ink_abi = { git = "https://github.com/paritytech/ink", package = "ink_abi", default-features = false, features = ["derive"], optional = true }
 ink_primitives = { git = "https://github.com/paritytech/ink", package = "ink_primitives", default-features = false }