add editorconfig file

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.prettierrc

@@ -1,4 +1,5 @@
 {
+  "tabWidth": 2,
   "semi": false,
   "singleQuote": true
 }