Add .editorconfig

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.{js,html}]
+indent_style = space