Write install script to use plotit as a command

[Aniq55]

Instead of writing python plotit.py ... from the project directory, the user should be able to run PlotIt as a custom command like plotit ... from any directory.

For reference and help:
https://github.com/NITDgpOS/SecureSnaps
[1] The install file
[2] The bin folder

[realsdx]

i would like to work on this issue

[djmgit]

@realsdx please go ahead. Would be nice you you are able to provide plotit a tray icon too.