feat: add WebIDE-specific README
Description
Adds README that will show in WebIDE
Related Issues
Resolves #1284
How has this been tested?
Run this branch in WebIDE https://gitlab.com/gitlab-org/gitlab-web-ide/blob/e1c2934fc3e877763c5f0c09d134230e3e9e05ad/docs/dev/development_environment_setup.md#L77
Screenshots (if appropriate)
Types of changes
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Bug fix (non-breaking change which fixes an issue) -
New feature (non-breaking change which adds functionality) -
Breaking change (fix or feature that would cause existing functionality to change) -
Documentation -
Chore (Related to CI or Packaging to platforms) -
Test gap