Adding all planets in Planets classroom

[Arun9739]

Is your feature request related to a problem? Please describe. There are only 3 planets available in the Planets classroom. I want to add all the planets of solar systems.

Describe the solution you'd like

• I will add related QR code and gif as it is there for other planets.
• I will follow the code style of the project.

[Arun9739]

Plz assign me this issue under Hacktoberfest.