be create swagger UI

[AdrieneTZ]

• Remove package swagger-autogen, these are the reasons:
  1. It looks too messy to write swagger specification in each controller as comments.
  2. I feel a strong cognitive load while writing the comments to meet swagger specification in each controller, so I write a swagger.json file.
• Automatically generating swagger json file is a great practice for developers, but codes should look clean and be easily read. I will look for some way to do an automatic generating process.
• swagger-ui-express reads the swagger.json file and generates Swagger UI.

[AdrieneTZ]

• Use force to push this branch after resolving the conflict.