docs: 이슈 템플릿 작성

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: PETTALK bug issue template
+about: 'about need to fix bug'
+title: "🐛 [Bug] "
+labels: Bug
+assignees: ''
+
+---
+## 🛠️ 어떤 버그를 고치나요?
+
+## 버그 작업 브랜치
+
+## ☑ Bug Fix TODOS
+- [x] 작업

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: PETTALK Feature request template
+about: feature
+title: "🚀 [Feature] "
+labels: Feature
+assignees: ''
+
+---
+## 🚀 어떤 기능을 만드나요?
+
+## 작업 중인 브랜치
+
+## ☑ Implement TODO
+- [x] 작업

.github/ISSUE_TEMPLATE/refactor.md

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+---
+name: PETTALK refactor issue template
+about: 'about need to refactor '
+title: " [Refactor] "
+labels: Refactor
+assignees: ''
+
+---
+## 🛠️ 리팩토링이 필요한 부분
+
+## 리팩토링 작업 브랜치
+
+## ☑ Refactoring TODO
+- [x] 작업

.github/ISSUE_TEMPLATE/style.md

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+---
+name: PETTALK Style issue template
+about: 'make Style Component'
+title: "💄 [Style] "
+labels: Style
+assignees: ''
+
+---
+## ✨ 어떤 Style 작업인가요?
+
+## 스타일 작업 브랜치
+
+## ☑ Style TODO
+- [x] 작업