1. The terminal works and outputs properly (determined by restrictions of exec).
2. Updated and cleaned up readme

shellbuiltins dont work.

TODO :

To enable sessions the design thought of is

The future design thought of is as follows. The items implemented as terminal should
become panes. Terminal should be all these together

               Terminal                 Panes

main  ---->    Init()
               Panes[]
               CommandWindow
               ProcessCommands() ---->  height
                                        width
                                        xPosition
                                        yPosition