Begin work on usage/extending manual

Author: Kiskae

EXTENDING.md

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+TODO

HOWTOUSE.md

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+TODO

README.md

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-Java-Source-Metrics
+Java Source Metrics
 ===================
+
+An application to calculate metrics from java bytecode. 
+This project was created for the purpose of performing a bachelor thesis.
+
+How to use: [HOWTOUSE.md](https://github.com/Kiskae/Java-Source-Metrics/blob/master/HOWTOUSE.md)
+Extending the application: [EXTENDING.md](https://github.com/Kiskae/Java-Source-Metrics/blob/master/EXTENDING.md)
+
+Compilation
+-----------
+
+Maven is used to handle our dependencies.
+
+* Install [Maven 3](http://maven.apache.org/download.html)
+* Check out this repo and run: `mvn`