add a readme

Author: CarlyLanglois

README.md

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+# About this Repository
+
+This repo contains starter code for the in-book examples for LaunchCode's
+[Java Web Development](https://education.launchcode.org/java-web-development/index.html)
+course. 
+
+## Requirements
+
+The classes in this repo require Java13. Please refer to the book referenced
+above for instructions on how to download and use the examples.
+
+## Updating
+
+Occasionally, the LaunchCode team will make changes to this repository
+that will affect your coursework. When you start your prep-work for each
+lesson of the course, be sure to fetch to stay up to date with the 
+latest changes.