Adding geodesyNETs papers under a space application heading.

[darioizzo]

I was not sure were these works fit exactly. They use the gravitational signature to learn a 3D implicit representation of irregular bodies. As such they solve the Laplace equation and could thus be placed in the PDE solutions section. But I though to create a space application section as I believe more implicit representation papers will shortly come with space related uses.

[XiaoyuShi97]

你好，这是石晓宇的邮箱。我会尽快处理该邮件