Add credentials in the event no awscli credentials are available.

Author: Chris LeBlanc

README.md

@@ -148,14 +148,19 @@ var AWS = require('aws-sdk');
 ```
 new AWS.DynamoDB.DocumentClient({
     region: 'localhost',
-    endpoint: 'http://localhost:8000'
+    endpoint: 'http://localhost:8000',
+    accessKeyId: 'bogusaccesskeyid',  // needed if you don't have aws credentials at all in env
+    secretAccessKey: 'bogussecretaccesskey' // needed if you don't have aws credentials at all in env
 })
 ```
 e.g. for dynamodb document client sdk
 ```
 new AWS.DynamoDB({
     region: 'localhost',
-    endpoint: 'http://localhost:8000'
+    endpoint: 'http://localhost:8000',
+    accessKeyId: 'bogusaccesskeyid',  // needed if you don't have aws credentials at all in env
+    secretAccessKey: 'bogussecretaccesskey' // needed if you don't have aws credentials at all in env
+
 })
 ```