Add contributing and license

Author: lizekai-richard

CONTRIBUTING.md

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+Welcome! We are glad that you by willing to contribute to the field of data distillation.
+
+**New Baselines**
+If you would like to report new baselines, please submit them by creating a pull request.
+The exact format is below:
+name of the baseline, code link, [paper link and score run using this tool].
+
+
+**Issues**
+If you want to submit issues, you are encouraged to submit yes directly in issues.

LICENSE

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+MIT License
+
+Copyright (c) 2024 DD-Ranking Team
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -212,6 +212,10 @@ The following results will be returned to you:
 Feel free to submit grades to update the DD-Ranking list. We welcome and value any contributions and collaborations.
 Please check out [CONTRIBUTING.md](./CONTRIBUTING.md) for how to get involved.
 
+## License
+
+DD-Ranking is released under the MIT License. See [LICENSE](./LICENSE) for more details.
+
 <!-- ## Acknowledgement
 
 DD-Ranking is a community project. The compute resources for development and testing are supported by the following organizations. Thanks for your support! -->