Add .idea to .gitignore

[audriu]

Added ignoring of .idea/ folder as it should be ignored. There was an entry in .gitignore file but it was commented for some reason.

Pre-Submission Checklist (optional but appreciated):

• I have read docs/CONTRIBUTING.md
• I have read docs/ROADMAP.md

OS Tests (optional but appreciated):

• Tested on Windows
• Tested on MacOS
• Tested on Linux

[KillianLucas]

Hi @audriu! I just want to make sure I understand why? Above that it says this:

For a more nuclear option (not recommended) you can uncomment the following to ignore the entire idea

I feel if they don't recommend it, we shouldn't do it. What do you think?

[audriu]

Well, that comment is just weird it includes the link to a template but does not include anything from it.
Usually, IDE configuration is not committed and I can see it is not committed to open-interpreter either.
Big projects just exclude IDE configurations completely like here: https://github.com/numpy/numpy/blob/main/.gitignore#L9
, https://github.com/pytorch/pytorch/blob/main/.gitignore#L227 , https://github.com/python/cpython/blob/main/.gitignore#L36