README.md. RISC-V example screenshot attached

[RogerHardiman]

Hi
cpufetch works great on my StarFive VisionFive2 SBC so took a screenshot to add to the README as Section 3.4
Noticed in the Examples of README.md there was no RISC-V example so made a fork and added one in.

The README.md and picture can be found here
master...RogerHardiman:cpufetch:additions

Thanks for a great utility, found via Thomas Kaiser's SBC project.

[Dr-Noob]

Sorry for the late reply. In order to mantain a similar look and feel trough the entire README, I have used your screenshot to recreate another one with the same background color. This way it looks better. Thanks for the screenshot and for the idea!