Add README.

Author: RubenVerborgh

README.md

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+# Linked Data Fragments Server <img src="http://linkeddatafragments.org/images/logo.svg" width="100" align="right" alt="" />
+Basic Linked Data Fragments server in Java.
+
+## Build
+Execute the following command to create a WAR file:
+```
+$ mvn install
+```
+
+## Deploy
+Use an application server such as [Tomcat](http://tomcat.apache.org/) to deploy the WAR file.
+
+Place an `ldf-server.json` configuration file with the data sources (analogous to the example file) in the `../conf` folder relative to the deployed WAR file.
+
+## Status
+This is software is still under development. It currently only supports:
+- HDT data sources
+- Turtle output
+
+A [more complete server](https://github.com/LinkedDataFragments/Server.js/) has been implemented for the Node.js platform.