Added Amazon DynamoDB transport instructions and link.

Author: jeffreypriebe

README.md

@@ -842,6 +842,35 @@ The Mail transport uses [emailjs](https://github.com/eleith/emailjs) behind the
 
 *Metadata:* Stringified as JSON in email.
 
+### Amazon DynamoDB Transport
+The [winston-dynamodb][26] transport uses Amazon's DynamoDB as a sink for log messages. You can take advantage of the various authentication methods supports by Amazon's aws-sdk module. See [Configuring the SDK in Node.js](http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html).
+
+``` js
+  var winston = require('winston'),
+      winstonDynamo = require("winston-dynamodb");
+
+  winstonDynamo.DynamoDB;
+  winston.add(winston.transports.DynamoDB, options)
+``` 
+
+Options:
+* __accessKeyId:__ your AWS access key id
+* __secretAccessKey:__ your AWS secret access key
+* __region:__ the region where the domain is hosted
+* __useEnvironment:__ use process.env values for AWS access, secret, & region. 
+* __tableName:__ DynamoDB table name
+
+To Configure using environment authentication:
+``` js
+  var options = {
+    useEnvironment: true,
+    tableName: 'log'
+  };
+  winston.add(winston.transports.DynamoDB, options); 
+```
+
+Also supports callbacks for completion when the DynamoDB putItem has been compelted. 
+
 ### Amazon SNS (Simple Notification System) Transport
 
 The [winston-sns][25] transport uses amazon SNS to send emails, texts, or a bunch of other notifications. Since this transport uses the Amazon AWS SDK for JavaScript, you can take advantage of the various methods of authentication found in Amazon's [Configuring the SDK in Node.js](http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html) document.
@@ -1040,3 +1069,4 @@ All of the winston tests are written in [vows][9], and designed to be run with n
 [23]: https://github.com/kenperkins/winston-papertrail
 [24]: https://github.com/jorgebay/winston-cassandra
 [25]: https://github.com/jesseditson/winston-sns
+[26]: https://github.com/inspiredjw/winston-dynamodb/