Add readme

Author: kravietz

README.md

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+# DropGoat
+
+DropGoat is an intentionally vulnerable Java web application written using [DropWizard](https://www.dropwizard.io/)
+framework that I use to teach application security and evaluate security scanners.
+
+## Usage
+
+You need a basic Java development environment with JDK and Maven. At this moment only JDK 8 will work.
+
+Buld the application:
+
+    mvn package
+
+And run the output JAR package:
+
+    java -jar target/DropGoat-1.0.jar server config.yml
+
+Then head to [http://localhost:8888/app/assets/index.html](http://localhost:8888/app/assets/index.html) to
+see its main page with links to specific exploits.