latest draft of readme. accepted most of jmj's changes.
latest draft of readme. accepted most of jmj's changes.

git-svn-id: https://windsvn2.nrel.gov/FAST/branches/BJonkman@746 10acb478-4768-415a-8850-bacdb5912d4d

Former-commit-id: fdd0a7750b381f90332df5feb473352fdf7e1119
OpenFAST/OpenFAST,OpenFAST/OpenFAST,OpenFAST/OpenFAST