add README

Author: thombergs

spring-boot/devtools-demo/README.md

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+# Configuring Spring Boot Dev Tools
+
+## Related Blog Posts
+
+* [Optimize Your Dev Loop with Spring Boot Dev Tools](https://reflectoring.io/spring-boot-dev-tools/)
+
+## Related Gradle Plugin
+
+Also have a look at my Gradle plugin that makes configuring Spring Boot Dev Tools easier:
+
+* [Spring Boot Dev Tools Gradle plugin](https://github.com/thombergs/spring-boot-devtools-gradle-plugin)