add prettierrc and editorconfig

.editorconfig

@@ -0,0 +1,8 @@
+root=true
+
+[*]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+insert_final_newline = true
+line_length = 120

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "useTabs": false
+}