Added additional code (DB and SpeechRecognition)

Added DB code in package "uni_klu.se2.reversi.usage_examples" and in
Board.java

Added SpeechRecognition code in package "uni_klu.se2.reversi.speech".
There is also a Usage Example in the ReversiSpeech.java File (Method:
example)

The usage examples are needed to be implemented in the GUI