Add CONTRIBUTORS.md (#166)

CONTRIBUTORS.md

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+# Contributors of Apache Teaclave (incubating)
+
+Teaclave adopts [The Apache Way](https://www.apache.org/theapacheway/).
+Everyone is more than welcome to contribute and make the project better.
+
+## Mentors
+
+Teaclave is now part of the Apache Incubator. We are fortunate to have the
+following mentors.
+
+- Felix Cheung	
+- Furkan Kamaci	
+- Jianyong Dai	
+- Luciano Resende	
+- Matt Sicker	
+- Zhijie Shen
+
+## Committers
+
+Committers are people who have made substantial contribution to the project and
+being active.
+
+- [Mingshen Sun](https://github.com/mssun) (PPMC)
+- [Pei Wang](https://github.com/uraj) (PPMC)
+- [Rundong Zhou](https://github.com/rdzhou) (PPMC)
+- [Tao Wei](https://github.com/LenxWei) (PPMC)
+- [Tongxin Li](https://github.com/litongxin1991) (PPMC)
+- [Yiming Jing](https://github.com/kevinis) (PPMC)
+- [Yu Ding](https://github.com/dingelish) (PPMC)
+- [Yulong Zhang](https://github.com/yulongzhang) (PPMC)
+- [Zhaofeng Chen](https://github.com/m4sterchain) (PPMC)
+
+## List of Contributors
+
+- [Full List of Contributors](https://github.com/apache/incubator-teaclave/graphs/contributors)
+- To contributors: please add yourself to the list.