[update] readme with referencies

Author: ui2code

README.md

@@ -36,6 +36,10 @@
   3. [Variables](translations/en_US/05-javascript.md#variables)
   4. [Performance](translations/en_US/05-javascript.md#performance)
 
+## Referencies
+
+- [airbnb - JavaScript Style Guide](https://github.com/airbnb/javascript)
+
 ## Contributing
 
 - Fork it!

translations/pt_BR/README.md

@@ -36,6 +36,11 @@
   3. [Javascript Variables](05-javascript.md#javascript-variables)
   4. [Javascript Performance](05-javascript.md#javascript-performance)
 
+## Referências
+
+- [airbnb - JavaScript Style Guide](https://github.com/airbnb/javascript)
+
+
 ## Contribuindo
 
 - Faça o fork!