[Project] devcontainer docs

[cheina97]

This PR contains the documentation for the devcontainer setup used in the Liqo project. It provides an overview of the features and behaviors of the devcontainer, which is designed to create a consistent and isolated development environment for contributors.

[adamjensenbot]

Hi @cheina97. Thanks for your PR!

I am @adamjensenbot.
You can interact with me issuing a slash command in the first line of a comment.
Currently, I understand the following commands:

• /rebase: Rebase this PR onto the master branch (You can add the option test=true to launch the tests
  when the rebase operation is completed)
• /merge: Merge this PR into the master branch
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• /test Launch the E2E and Unit tests
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Make sure this PR appears in the liqo changelog, adding one of the following labels:

• feat: 🚀 New Feature
• fix: 🐛 Bug Fix
• refactor: 🧹 Code Refactoring
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[cheina97]

/rebase