Update issue templates

Author: JalanJiang

.github/ISSUE_TEMPLATE/-----.md

@@ -2,7 +2,7 @@
 name: 添加待解题
 about: 我是莫得感情的刷题机器
 title: ''
-labels: ''
+labels: TODO-J, TODO-C
 assignees: JalanJiang, csming1995
 
 ---