Adding code lines

[suriyahgit]

Added additional code lines for different chapters. I would like to mention that, while trying to render the code lines to html, I am facing an error in the '02-Spaces.qmd', that states:

"Quitting from lines 718-729 (02-Spaces.qmd) Error in plot.new() : outer margins too large (figure region too small) Calls: .main ... plot.stars -> .image_scale -> plot -> plot.default -> plot.new

Execution halted"

I tried to solve this, but I couldn't sort it out...