[gtk/ebassi/editor-config] Add editorconfig file

[Emmanuele Bassi <ebassi src gnome org>]

commit f1fbd363f8dcb955672e4b51ce4901fd6751296e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Oct 28 18:17:02 2021 +0100

    Add editorconfig file
    
    Editors that support configuration through the editorconfig spec:
    
      https://editorconfig.org
    
    should be able to have a subset of the GTK coding style and options
    immediately available to them.
    
    Plus, it's better than using relics from the Dark Ages, like modelines.

 .editorconfig | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
---
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000000..1e43ac89d5
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: 2021 The GTK Authors
+# SPDX-License-Identifier: CC0-1.0
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+
+[*.[ch]]
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+# For the legacy tabs which still exist in the code:
+tab_width = 8
+
+[*.ui]
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+
+[*.xml]
+indent_size = 2
+indent_style = space
+
+[meson.build]
+indent_size = 2
+indent_style = space
+
+[*.md]
+max_line_length = 80