Update README with instructions for obtaining the shaded JAR

The shaded JAR will be published to the GitHub releases page for
easier access. We assume that people who want the shaded JAR are not
already using Maven, so publishing the shaded JAR as an artifact would
complicate things.

Author: dchenbec

README.md

@@ -60,7 +60,11 @@ Set the Region explicitly in your `advanced.auth-provider.class` configuration (
 
 ## Add the Authentication Plugin to the Application
 
-The authentication plugin supports version 4.x of the DataStax Java Driver for Cassandra. If you’re using Apache Maven, or a build system that can use Maven dependencies, add the following dependencies to your `pom.xml` file.
+The authentication plugin supports version 4.x of the DataStax Java Driver for Cassandra.
+
+### With Maven/Ivy
+
+If you’re using Apache Maven, or a build system that can use Maven dependencies, add the following dependencies to your `pom.xml` file.
 
 ``` xml
 <dependency>
@@ -70,6 +74,12 @@ The authentication plugin supports version 4.x of the DataStax Java Driver for C
 </dependency>
 ```
 
+### Download the Shaded JAR
+
+If you just need the JAR to use with a third party tool, please use the shaded JAR (includes the SDK and other
+dependencies) located in the [releases](https://github.com/aws/aws-sigv4-auth-cassandra-java-driver-plugin/releases)
+section on GitHub.
+
 ## How to use the Authentication Plugin
 
 When using the open-source DataStax Java driver, the connection to your Amazon Keyspaces endpoint is represented by the `CqlSession` class. To create the `CqlSession`, you can either configure it programmatically using the `CqlSessionBuilder` class (accessed via `CqlSession.builder()`) or with the configuration file.