message: docs(browser-repl): Add readme
diff: # Browser Repl
  React Browser component for Mongo Shell
  +
  +## Usage
  +
  +``` js
  +import { Shell } from 'mongosh-browser-repl';
  +
  +export () => {
  + return <Shell runtime={runtime} />;
  +}
  +```
  +
  +### Available Runtimes
  +
  +#### ElectronRuntime
  +
  +Uses Node.js `vm` module as sandbox for code execution.
  +
  +``` js
  +import { ElectronRuntime } from 'mongosh-browser-repl';
  +
  +const runtime = new ElectronRuntime(serviceProvider);
  +```
  +
  +#### IframeRuntime
  +
  +Uses an iframe window as sandbox for code execution. **NOTE:** the execution is not really sandboxed, the top window is accessible.
  +
  +``` js
  +import { IframeRuntime } from 'mongosh-browser-repl';
  +
  +const runtime = new IframeRuntime(serviceProvider);
  +```
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