Add readme with tutorial link

Author: AdamZink

README.md

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+### Spring Boot MySQL Demo
+
+This project was created as a starting point for a simple MySQL-backed REST API.
+
+<br />
+
+Tutorials are available to explain the steps on [Medium](https://medium.com/@cellularcinema):
+
+##### Getting Started with Spring Boot, Hibernate, Jersey, and MySQL
+* [Part 1 - Getting Spring Initializr project to run](https://medium.com/@cellularcinema/getting-started-with-spring-boot-hibernate-jersey-and-mysql-part-1-9aea23a9a32d)
+