merge pull request #2 from DongyunLee/patch-1

Update nim_wiki.md

Author: mydearxym

nim_wiki.md

@@ -1,3 +1,5 @@
 官方网站: [https://nim-lang.org/](https://nim-lang.org/)
 
 官方文档: [https://nim-lang.org/documentation.html](https://nim-lang.org/documentation.html)
+
+“Nim开发集中营”QQ群：[469329878](https://jq.qq.com/?_wv=1027&k=5yDFp6R)