README: Add blurb about why this emu is special; move symbolic to sep. section; add HACKING section
README: Add blurb about why this emu is special; move symbolic to sep. section; add HACKING section

piratejon/msp430-emu-uctf,cemeyer/avr-emu,piratejon/msp430-emu-uctf,cemeyer/msp430-emu-uctf,nedwill/msp430-emu-uctf