docs: 이슈 템플릿 추가

Author: AAminha

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 📖 DESCRIPTION
+
+이슈 요약
+
+## ✨ TODO
+
+- [ ] todo
+- [ ] todo
+
+## 🖼️ Figma View
+
+작업하는 피그마 이미지 첨부 (선택)