Adding the segment

Creation of segment with GLut.
Adding the circle

Creation of a circle with GLut library.
Change in README

Correction.
Revert "Change in README"

This reverts commit 51f387fff72e22bc12747bf7dbe7d2d07a8395c6.
Merge branch 'master' of https://github.com/SoMysrie/ComputerGraphicsProjetc