Add .editorconfig file

To make contributing to libcamera more fun, see
https://editorconfig.org/

Signed-off-by: Robert Mader <robert.mader@collabora.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

.editorconfig

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: CC0-1.0
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{cpp,h}]
+indent_size = 8
+indent_style = tab
+
+[*.json]
+indent_size = 4
+indent_style = space
+
+[*.py]
+indent_size = 4
+indent_style = space
+
+[*.yaml]
+indent_size = 2
+indent_style = space
+
+[{meson.build,meson_options.txt}]
+indent_size = 4
+indent_style = space