add editorconfig

.editorconfig

@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: WTF Kooperative eG <https://wtf-eg.de/>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[*.{json,js,vue}]
+indent_size = 2
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[*.html]
+indent_size = 2
+
+[*.{css,scss}]
+indent_size = 2