Updates docs to show one line command to add basic packages (#303)

README.md

@@ -77,6 +77,10 @@ $ npm i --save @fortawesome/fontawesome-svg-core
 $ npm i --save @fortawesome/free-solid-svg-icons
 $ npm i --save @fortawesome/react-fontawesome
 ```
+or
+```
+$ npm i --save @fortawesome/fontawesome-svg-core  @fortawesome/free-solid-svg-icons @fortawesome/react-fontawesome
+```
 
 Or with Yarn:
 
@@ -85,6 +89,10 @@ $ yarn add @fortawesome/fontawesome-svg-core
 $ yarn add @fortawesome/free-solid-svg-icons
 $ yarn add @fortawesome/react-fontawesome
 ```
+or
+```
+$ yarn add @fortawesome/fontawesome-svg-core @fortawesome/free-solid-svg-icons @fortawesome/react-fontawesome
+```
 
 ## Add more styles or Pro icons