docs: function addJestToPackageJson(destinationRoot) {
    var packageJSONPath = path.join(destinationRoot, 'package.json');
    var packageJSON = JSON.parse(fs.readFileSync(packageJSONPath));
  
    packageJSON.scripts.test = 'jest';
    packageJSON.jest = {
      preset: 'react-native'
    };
    fs.writeFileSync(packageJSONPath, JSON.stringify(packageJSON, null, '\t'));
  }