chore(xtac+starter): improve readme files

* Link XTaC -> XTaC Starter
* Fix link to examples of XTaC
* Add link to examples and documentation to XTaC Starter

closes camunda#1445

clients/java/README.md

@@ -3,12 +3,13 @@
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.camunda.bpm/camunda-external-task-client/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.camunda.bpm/camunda-external-task-client)
 
+> Are you looking for the Spring Boot External Task Client? This way please: [Spring Boot External Task Client](../../spring-boot-starter/starter-client)
 
 The **Camunda External Task Client (Java)** allows to set up remote Service Tasks for your workflow.
 
 * [Quick Start](https://docs.camunda.org/get-started/quick-start/)
 * [Documentation](https://docs.camunda.org/manual/develop/user-guide/ext-client/)
-* [Examples](https://github.com/camunda/camunda-external-task-client-java/tree/master/examples)
+* [Examples](https://github.com/camunda/camunda-bpm-examples/tree/master/clients/java)
 
 ## Features
 * Complete External Tasks

spring-boot-starter/starter-client/README.md

@@ -2,6 +2,9 @@
 
 This project provides a Spring Boot Starter that allows you to implement an External Task Worker for Camunda. It uses the Camunda REST API to fetch, lock, and complete External Service Tasks. It is based on the [Java External Task Client](../../clients/java).
 
+* [Documentation](https://docs.camunda.org/manual/develop/user-guide/ext-client/spring-boot-starter/)
+* [Examples](https://github.com/camunda/camunda-bpm-examples/tree/master/spring-boot-starter/external-task-client)
+
 ## Dependency
 
 You need this dependency to get started: