chore: 트러블 슈팅 이슈 템플릿 추가

Author: soonge2

.github/ISSUE_TEMPLATE/custom.md

@@ -0,0 +1,10 @@
+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/스프린트-백로그-.md

@@ -2,7 +2,7 @@
 name: '스프린트 백로그 '
 about: Github Project용 스프린트 백로그 템플릿
 title: ''
-labels: 백로그
+labels: BE, 백로그, 트러블 슈팅
 assignees: soonge2
 
 ---