upadating README: notes on CommonJS autocomplete (axios#2256)

closes axios#2226. add note on how to gain typings / autocomplete / intellisense when using CommonJS (`require()`) imports

README.md

@@ -57,6 +57,15 @@ Using cdn:
 
 ## Example
 
+### note: CommonJS usage
+In order to gain the TypeScript typings (for intellisense / autocomplete) while using CommonJS imports with `require()` use the following approach:
+
+```js
+const axios = require('axios').default;
+
+// axios.<method> will now provide autocomplete and parameter typings
+```
+
 Performing a `GET` request
 
 ```js