Use tabs for indentation of rust code

This is my preference.

.editorconfig

@@ -0,0 +1,23 @@
+# EditorConfig configuration for zonewatch
+# https://EditorConfig.org
+
+# Top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file, utf-8 charset
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.rs]
+indent_style = tab
+
+[*.nix]
+indent_size = 2
+indent_style = space
+
+[*.lock]
+insert_final_newline = unset
+indent_size = unset

.rustfmt.toml

@@ -0,0 +1,2 @@
+edition = "2021"
+hard_tabs = true

main.rs

@@ -0,0 +1,3 @@
+fn main() {
+	println!("Hello, world!");
+}