Add Developer guidelines

[sbliven]

@rmoszczynski asked:

Is there a document describing development conventions? A general guideline for developers to follow?

Some partial pages

• http://biojava.org/wiki/BioJava3%3ACoding_Conventions
  • Overly short and the links are broken.
• http://biojava.org/wiki/BioJava%3AHackers_Guide
  • Still refers to CVS!

Ok, maybe this is a good start point for me to suggest some conventions.

[andreasprlic]

We should create a new "For Developers" section...