message: Update todo-list-common README
diff: Welcome to the todo-list-common plugin!
  _This plugin was created through the Backstage CLI_
  -
  -## Getting started
  -
  -Your plugin has been added to the example app in this repository, meaning you'll be able to access it by running `yarn start` in the root directory, and then navigating to [/todo-list-common](http://localhost:3000/todo-list-common).
  -
  -You can also serve the plugin in isolation by running `yarn start` in the plugin directory.
  -This method of serving the plugin provides quicker iteration speed and a faster startup and hot reloads.
  -It is only meant for local development, and the setup for it can be found inside the [/dev](./dev) directory.
  