Add .editorconfig

Author: stephank

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+max_line_length = 80
+
+[*.php]
+indent_size = 4
+max_line_length = 120