Add an editorconfig

.editorconfig

@@ -0,0 +1,11 @@
+#SPDX-FileCopyrightText: 2023 Pavel 'LEdoian' Turinský <mimeapps@pokemon.ledoian.cz>
+#SPDX-License-Identifier: CC0-1.0
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 4