Merge pull request #5 from aws/LienNguyen2910-patch-5

Update README.md

README.md

@@ -2,6 +2,9 @@
 
 This repo contains examples for integrating an AWS IoT ExpressLink module into an application.  These examples are intended to demonstrate how to perform the common operations for an IoT device.
 
+The common AT Commands can be found at [Programmer's Manual](https://docs.aws.amazon.com/iot-expresslink)
+Information about specific modules from AWS partners can be found at AWS Partner Network's Device Catalog from the [main page](https://aws.amazon.com/iot-expresslink). Module datasheet, Getting Started Guide, and Product Information are also included in the device catalog. 
+
 ## Security
 
 See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more information.