Add .editorconfig file.

This allows editors and IDEs to automatically adjust settings to
the coding style prefered by Wine (cf. https://editorconfig.org/).

Signed-off-by: Eberhard Beilharz <eb1@sil.org>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+# Defaults
+[*]
+indent_style = space
+indent_size = 4
+tab_width = 8
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 100