adds docs describing how to target different AEM versions

Author: tgallant

README.md

@@ -28,6 +28,15 @@ The Java Jar/Maven Dependency that exposes all allowed Java APIs that can be use
 </dependency>
 ```
 
+## Targeting other AEM versions
+
+This repo contains a separate branch for supporting different versions of AEM.
+Be sure to check the available branches and use the one appropriate for the AEM
+version you are targeting.
+
+For example here is the branch you should use if you are targeting AEM 6.5.0
+https://github.com/Adobe-Marketing-Cloud/aem-translation-framework-bootstrap-connector/tree/aem650
+
 It is recommended that the version entry for the SDK should match the version of AEM as a Cloud Service.
 You can see what version you are using by logging in to AEM, then going to the question mark in the top right corner of
 the screen and selecting About Adobe Experience Manager