add .env file so VSCode autocomplete functions work

[irm-codebase]

Added an .env file pointing PYTHONPATH to ./src so that VSCode can perform autocomplete functions for our code.

Small quality of life stuff.

[brynpickering]

Not sure what problem you're trying to solve here. If you follow the development install instructions and then link the mamba env to Python: Select Interpreter in VSCode, you get autocomplete. Example:

Screen.Recording.2024-02-19.at.14.03.24.mov

[irm-codebase]

This is quite odd... I swear it was not working before.
It may be related to some issues that VSCode has been having with miniforge (microsoft/vscode-python#22918), sometimes it refuses to activate the environment even after specifying it.

I'll close the pull request.

[brynpickering]

Interesting. I have this duplication issue but then I don't use the inbuilt vscode debugger so haven't had to deal with its ability to keep track of the environment correctly when debugging...

[irm-codebase]

What do you use as a debugger instead? This issue is completely breaking debug functionalities on my end, and I cannot test some things on the toy model :(