Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+### Guidelines
+
+Fork this repository and add new papers:
+If you want to add a new result, just click the small edit button for the corresponding task in the upper right corner of the file (see below).
+
+<img width="1238" alt="截屏2021-05-18 10 20 44" src="https://user-images.githubusercontent.com/15137975/118580807-1a23ed80-b7c3-11eb-851a-9e918ec03b93.png">
+
+This allows you to edit the file in Markdown. Just add the information of a paper to the corresponding list in the same format. After making changes, click the "Preview Changes" tab at the top of the page to ensure that the list can still be displayed normally. If everything looks good, go to the bottom of the page and you will see the following table.
+
+<img width="1237" alt="截屏2021-05-18 10 21 26" src="https://user-images.githubusercontent.com/15137975/118580854-345dcb80-b7c3-11eb-80dd-810dc250d4a0.png">
+
+Add a name and an optional description for your proposed change, indicating that you want to "create a new branch for this commit and initiate a pull request", and then click "Suggest file changes."