Improve README titles and add TOC to samples README (#93)

Author: bobwatso-aws

README.md

@@ -1,4 +1,4 @@
-# AWS IoT SDK for Java v2
+# AWS IoT Device SDK for Java v2
 
 This document provides information about the AWS IoT device SDK for Java V2.
 

samples/README.md

@@ -1,4 +1,14 @@
-# Samples
+# Sample apps for the AWS IoT Device SDK for Java v2
+
+* [Shadow](#shadow)
+* [Jobs](#jobs)
+* [fleet provisioning](#fleet-provisioning)
+
+**Additional sample apps not described below:**
+* [BasicPubSub](https://github.com/aws/aws-iot-device-sdk-java-v2/tree/master/samples/BasicPubSub)
+* [Greengrass](https://github.com/aws/aws-iot-device-sdk-java-v2/tree/master/samples/Greengrass)
+* [PubSubStress](https://github.com/aws/aws-iot-device-sdk-java-v2/tree/master/samples/PubSubStress)
+* [RawPubSub](https://github.com/aws/aws-iot-device-sdk-java-v2/tree/master/samples/RawPubSub)
 
 ## Shadow