New README.md

@seriousamlqz, @yzhang90, @grosu Please review

@grosu, please assign someone who knows better than me to write the Static Weaving Section: I don't use that option.
This -usedb option confuses me.  What does it do?  And why do we need it?  I mean, why not simply provide a folder which contains all these properties, and then let the users create an agent for them same like any other agent they create.  That will also help them a lot to learn how to write their own properties, because they can see those as examples.