Added ::= .rustfmt.toml; fixes #24

.rustfmt.toml

@@ -0,0 +1,38 @@
+######################## GNU General Public License 3.0 ########################
+##                                                                            ##
+## Copyright (C) 2024 Kevin Matthes                                           ##
+##                                                                            ##
+## This program is free software: you can redistribute it and/or modify       ##
+## it under the terms of the GNU General Public License as published by       ##
+## the Free Software Foundation, either version 3 of the License, or          ##
+## (at your option) any later version.                                        ##
+##                                                                            ##
+## This program is distributed in the hope that it will be useful,            ##
+## but WITHOUT ANY WARRANTY; without even the implied warranty of             ##
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              ##
+## GNU General Public License for more details.                               ##
+##                                                                            ##
+## You should have received a copy of the GNU General Public License          ##
+## along with this program.  If not, see <https://www.gnu.org/licenses/>.     ##
+##                                                                            ##
+################################################################################
+
+################################################################################
+##
+##  AUTHOR      Kevin Matthes
+##  BRIEF       Settings for rustfmt.
+##  COPYRIGHT   GPL-3.0
+##  DATE        2024
+##  FILE        .rustfmt.toml
+##  NOTE        See `LICENSE' for full license.
+##              See `README.md' for project details.
+##
+################################################################################
+
+# Line width settings.
+max_width = 80
+
+# Indentation settings.
+tab_spaces = 4
+
+################################################################################