Add editorconfig

.editorconfig

@@ -0,0 +1,39 @@
+# See https://editorconfig.org/
+root = true
+
+[*]
+end_of_line = lf
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.{c,h}]
+indent_style = tab
+indent_size = 8
+
+[*.cpp]
+indent_style = space
+indent_size = 4
+
+[qt/**.h]
+indent_style = space
+indent_size = 4
+
+[*.sh]
+indent_style = space
+indent_size = 4
+
+[meson.build]
+indent_style = space
+indent_size = 4
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.xml]
+indent_style = space
+indent_size = 2
+
+[docs/**.xml]
+indent_style = tab
+indent_size = 8