Update gitignore to add local editor config directories

Problem:

Currently, our .gitignore file does not ignore the local settings directories for various common rust and C/C++ IDEs.

Solution:

Add the following to the gitignore:

.vs -- Visual Studio Pro .vscode -- Visual Studio Code .idea -- RustRover/CLion/IntelliJ Idea .devcontainer -- The local settings folder used by devcontainers, which are supported by all of the above IDEs

Changes introduced by this pull request:

• The .gitignore was updated to ignore IDE-specific user settings folders

Drawbacks:

• We may need to maintain a list of these for obscure editors
• Cookbook projects will need to add these to their local .gitignore files.

TODOs:

Fixes:

The ".idea" folder currently shows up as an uncommitted change in the repo.

State: ready

Blocking/related:

Other:

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