To Add no_of_moons in planets data

[ombhojane]

Currently following parameters are associated with planets. I want to contribute for more data about planet here. To start small and learn codebase properly, I want add No of Moons of each planet in AstroLib.planets[].

Current Output:

Expected Output:

julia> AstroLib.planets["earth"] Planet: Earth mean radius: 6.371e6 m equatorial radius: 6.378137e6 m polar radius: 6.356752e6 m mass: 5.97237e24 kg eccentricity: 0.01671123 semi-major axis: 1.495982611504425e11 m period: 3.15581497635456e7 s inclination -1.531e-5 ° longitude of ascending node0.0 ° longitude of perihelion 102.93768193 ° mean longitude 100.46457166 ° no of moons 1

Further, I would like to add more useful data about Planets and Observatories to improve the space exploration experience!

Please assign this issue to me! GSoC 2024 :)