docs: Added instructions for npm install in main dir

RichardLitt · RichardLitt · commit 6d1417181452 · 2015-03-04T09:52:54.000-08:00
Closes react-bootstrap#433
diff --git a/docs/README.md b/docs/README.md
@@ -16,6 +16,8 @@ $ cd react-bootstrap/docs
 $ npm install
 ```
 
+You must have previously run `npm install` from the main directory. 
+
 ### Instructions
 
 #### Development
