Feature Request: Cross-Range/Down-Range to NED

[cojmeister]

Add a function that can calculate LatLonAlt of a point given Cross Range and Down Range distances and reference point and azimuth. I use this package daily, and this conversion would really help.

def crdr2ned(cross_range: float, down_range: float, azimuth: float, lat0: float, lon0: float, h0: float, deg: bool = True) -> tuple[float, float, float]:
    pass

If deemed relevant I can write down my mathematical approach, or just open a PR.

LMK!