Add simulation page

[levilevente]

some mini html-css-js simulations of solar system or similar things. maybe for all planet add their moons and simulate it. not in a resource expensive way.

useful links:
https://www.youtube.com/watch?v=opd_ZZYFWLA
https://www.youtube.com/watch?v=qCp9mipNKuo
https://www.youtube.com/watch?v=dlLGVHV_9Zk

complex ones:
https://github.com/N3rson/Solar-System-3D
https://www.youtube.com/watch?v=5Wj3TnktlGc