message: Add missing but necessary step in setup guide
diff: @@ -34,7 +34,19 @@ Go to `Menu > Plugins > Development > +` and select the `mainfest.json` file.
  ## Running plugin
  -Go to File Menu > Plugins > Development and select your plugin.
  +First start webpack:
  +
  +```
  +yarn webpack:watch
  +```
  +
  +Or with npm:
  +
  +```
  +npm run webpack:watch
  +```
  +
  +Then in Figma go to `File Menu > Plugins > Development` and select your plugin.
  It's expected result:
  ![running result](/img/running-result.png)
  