Added a build script
Added a build script

To use it, use one of the following:

./build.sh # The same as ./build.sh build, builds the program
Or:
./build.sh clean # Clean the build

Pyxxil/Ncurses-LC3-Simulator,Pyxxil/Ncurses-LC3-Simulator,Pyxxil/Ncurses-LC3-Simulator