Summary:
Pull Request resolved: https://github.com/react/react-native/pull/57273
**Motivation**
A README is the first thing an npm visitor sees on each package; internal-repo boilerplate like the "Testing" sections and the "We're using yarn…" note doesn't belong on a published package page.
**Changes**
- Standardize every README: a `# react-native/<name>` heading, a user-facing description, and a blue version badge plus a green monthly-downloads badge.
- Keep the "internal dependency" prelude only on `community-cli-plugin`, `virtualized-lists`, and `js-polyfills`.
- Drop the monorepo-template "Testing" sections and yarn note.
- Rework `metro-config` around the Configuring Metro guide; add missing READMEs for `metro-babel-transformer` and `popup-menu-android`.
Changelog: [Internal]
Reviewed By: emily8rown
Differential Revision: D109017270
fbshipit-source-id: 6208294c4ad2e6235a6605ae54f22d730f0476e7
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51688
Changelog: [Internal]
# Context
See D74904547.
## This diff
Creates the `react-native/debugger-shell` package, containing a basic implementation of an Electron-based shell for React Native DevTools. At this point, there is no direct dependency on the new package from the rest of React Native - it's designed to be used as part of a Meta-internal experimental rollout of the new debugger shell via the `BrowserLauncher` interface in `dev-middleware`.
Reviewed By: huntie
Differential Revision: D74820232
fbshipit-source-id: cb06ea9e2ed8c8822019cad8296cc19e69f9db0b
Alex Hunt