added main code file.
added main code into src
Move main.cpp into src directory
began implementation of code.
Merge branch 'exec' of https://github.com/bchen022/rshell into exec
commit for main
removed junk file.
finished parsing: multiple commands; need loop
parsing correctly, working on exit
got exit and comments done.
got && to work but exit now malfunctioning
or with exit still buggy
updated Makefile
updated readme
final changes to main.