Feat support analyse languages

[fyangstudio]

doctor 支持 项目分析，可返回语言分布，示例：

{ languages:[
     { language: 'Other', count: 1 },
     { language: 'JSON', count: 3 },
     { language: 'Markdown', count: 1 },
     { language: 'TypeScript', count: 16 },
     { language: 'JavaScript', count: 1 } 
 ] }