Add Jiayuan Yao to AUTHORS.md (#984)

Author: core-man

AUTHORS.md

@@ -9,6 +9,7 @@ The following people have contributed code and/or documentation to the project
 (alphabetical by name) and are considered to be "PyGMT Developers":
 
 * [Dongdong Tian](https://seisman.info/) | [0000-0001-7967-1197](https://orcid.org/0000-0001-7967-1197) | Michigan State University
+* [Jiayuan Yao](https://github.com/core-man) | [0000-0001-7036-4238](https://orcid.org/0000-0001-7036-4238) | Nanyang Technological University
 * [Leonardo Uieda](http://www.leouieda.com/) | [0000-0001-6123-9515](https://orcid.org/0000-0001-6123-9515) | University of Liverpool
 * [Liam Toney](https://liam.earth/) | [0000-0003-0167-9433](https://orcid.org/0000-0003-0167-9433) | University of Alaska Fairbanks
 * [Malte Ziebarth](https://github.com/mjziebarth) | [0000-0002-5190-4478](https://orcid.org/0000-0002-5190-4478) | GFZ German Research Centre for Geosciences