feat: init with rust lib and bin crate

templates/default/rust/app/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "app"
+edition = "2021"
+version.workspace = true
+
+[dependencies]
+lib = { path = "../lib" }
+
+anyhow = { workspace = true }
+log = { workspace = true }
+env_logger = { workspace = true }

templates/default/rust/app/src/main.rs

@@ -0,0 +1,6 @@
+fn main() {
+    let (a, b) = (1, 1);
+    let r = lib::add(a, b);
+
+    println!("{a} + {b} = {r}");
+}