add rotom project

[xgzlucario]

Please check if what you want to add to awesome-go-storage list meets quality standards before sending pull request. Thanks!

Please provide package links to:

• github.com repo:
• godoc.org:
• goreportcard.com:
• coverage service link (gocover, coveralls etc.):

Note: that new categories can be added only when there are 3 packages or more.

Make sure that you've checked the boxes below before you submit PR:

• [x] I have added my package in alphabetical order
• [x] I know that this package was not listed before
• [x] I have added godoc link to the repo and to my pull request
• [x] I have added coverage service link to the repo and to my pull request
• [x] I have added goreportcard link to the repo and to my pull request
• [x] I have read Contribution guidelines and Quality standard.

Thanks for your PR, you're awesome! :+1:

[yufeifly]

您好，您的邮件已收到，谢谢。——熊宇飞