Here I will upload different visualizations with the code and achieved result (in png).
I will make A LOT of comments - just to be sure that those who are only starting to learn ggplot2 will understand everything (and sorry, all the comments will be in Russian)
You can find the code, data and the image named as "line-lolipop"
You can find the code, data and the image named as "linegrapg with median"