增加维基百科“沈阳事件”词条

[liruqi]

https://zh.wikipedia.org/wiki/%E6%B2%88%E9%98%B3%E4%BA%8B%E4%BB%B6

[sagittarish]

The hou xu shi jian (following events) part is not correct. Right after the incidence, a student ( Deng Yuhao) from the Mathamatics faculty of PKU initiated the act of filing a public application to the school to request for the full release of related documents 20 years ago. Yue xin is one of the 10 students who responded to the initiation, and filed her application. Later on she was approached by teachers of her faculties and the following incidents happened.

[liruqi]

谢谢 merge。

说明一下，我是用 https://github.com/liruqi/mediawiki-to-gfm 从维基百科的格式转成 GitHub markdown 格式。基本上可以看了，但是还有很多坏链接。

本人时间精力有限，各位有空可以帮忙改进。