Add "in code" to the description of the CDK (aws#635)

README.md

@@ -6,7 +6,7 @@
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 The **AWS Cloud Development Kit (AWS CDK)** is an open-source software development 
-framework to define cloud infrastructure and provision it through AWS CloudFormation.
+framework to define cloud infrastructure in code and provision it through AWS CloudFormation.
 The CDK integrates fully with AWS services and offers a higher level object-oriented
 abstraction to define AWS resources imperatively. Using the CDK’s library of
 infrastructure [constructs], you can easily encapsulate AWS best practices in your