Create .editorconfig (#17782)

Create .editorconfig

.editorconfig

@@ -0,0 +1,17 @@
+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.php]
+indent_size = 8
+
+[*.md]
+trim_trailing_whitespace = false