adcs-66 add readme files

[Aidan-Sheedy]

CHANGES

• Added readme files for the cpp simulator (MATLAB users can't read)
• Added minor fix to the UI to prevent unnecessary extra plots from being made

REASON User facility

TESTING N/A

GITHUB LINK https://github.com/queens-satellite-team/adcs/issues/66

Signed-off-by: Aidan Sheedy Aidan.P.Sheedy@gmail.com