Create devcontainer.json

[Flores-21]

Fixes #

To test:

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• [x] I have completed the Regression Notes.
• [x] I have considered adding unit tests for my changes.
• [x] I have considered adding accessibility improvements for my changes.
• [x] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• [x] WordPress.com sites and self-hosted Jetpack sites.
• [x] Portrait and landscape orientations.
• [x] Light and dark modes.
• [x] Fonts: Larger, smaller and bold text.
• [x] High contrast.
• [x] VoiceOver.
• [x] Languages with large words or with letters/accents not frequently used in English.
• [x] Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• [x] iPhone and iPad.
• [x] Multi-tasking: Split view and Slide over. (iPad)

[kean]

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