add, apply rustfmt.toml

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "simfonic"
+version = "0.1.0"

rustfmt.toml

@@ -0,0 +1 @@
+hard_tabs = true

src/main.rs

@@ -1,3 +1,3 @@
 fn main() {
-    println!("Hello, world!");
+	println!("Hello, world!");
 }