Add editor config

.editorconfig

@@ -0,0 +1,29 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[*.xml]
+indent_style = space
+indent_size = 4
+
+[*.neon]
+indent_style = tab
+indent_size = 4
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 4
+
+[composer.json]
+indent_style = space
+indent_size = 4