create cs file

[demouse021]

Please follow the guide below

• You will be asked some questions, please read them carefully and answer honestly

• Put an x into all the boxes [ ] relevant to your pull request (like that [x])

• Use Preview tab to see how your pull request will actually look like

• [ ] Searched for similar pull requests

• [ ] Compiled the code with Visual Studio

• [ ] Require translation update

• [ ] Require document update (readme.md, wikipage, etc)

What is the purpose of your pull request?

• [ ] Bug fix
• [ ] Improvement
• [ ] New feature

---

Description of your pull request and other information

Explanation of your pull request in arbitrary form goes here. Please make sure the description explains the purpose and effect of your pull request and is worded well enough to be understood. Provide as much context and examples as possible.