README.md: Fix developer formating. Crypter.java: remove main method.

Remove lines after developer Anton's name to make it same as other
developers.

Remove main method from Crypter.java and add a constructor to
make it an object class. Document the constructor. Remove parameters
from a method since they are no longer needed.

Signed-off-by: Raido Roomets <raido.roomets@cs.tamk.fi>