Improve docstrings to help users

[MarcSkovMadsen]

Docstrings can help users or contributors like me working in VS Code use the package much more efficiently.

Examples

pydantic-panel/pydantic_panel/pane.py

Line 39 in 040a55a

def __init__(self, object=None, **params):

https://github.com/jmosbacher/pydantic-panel/blob/master/pydantic_panel/__init__.py

[MarcSkovMadsen]

For me it would helpful with some documentation in the style of the top-level module __init__.py file in Panel and any Panel widget __init__.py file.