Initial commit with test and src
 Changes to be committed:
	new file:   src/contents/CDouble.java
	new file:   src/contents/CLetter.java
	new file:   src/contents/CReceipt.java
	new file:   src/contents/CString.java
	new file:   src/contents/Contents.java
	new file:   src/inhabitant/BankAccount.java
	new file:   src/inhabitant/City.java
	new file:   src/inhabitant/Inhabitant.java
	new file:   src/letter/AcuReceipt.java
	new file:   src/letter/Letter.java
	new file:   src/letter/PromissaryNote.java
	new file:   src/letter/RegisteredLetter.java
	new file:   src/letter/SimpleLetter.java
	new file:   test/inhabitant/BankAccountTest.java
	new file:   test/inhabitant/InhabitantTest.java
	new file:   test/letter/PromissaryNoteTest.java
	new file:   test/letter/RegisteredLetterTest.java
	new file:   test/letter/SimpleLetterTest.java