chore: added issue templates

Author: soumyamahunt

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug] "
+labels: bug
+assignees: ''
+
+---
+
+- [ ] I have read the [documentation](https://swiftpackageindex.com/SwiftyLab/MetaCodable/main/documentation/metacodable).
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information, remove ones not applicable):**
+ - OS: [e.g. macOS, Ubuntu]
+ - Version [e.g. 14.3.1, 22.04]
+ - Xcode [e.g. 15.2]
+ - Swift [e.g. 5.9]
+ - CocoaPods [e.g. 1.14.3]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature Request] "
+labels: enhancement
+assignees: ''
+
+---
+
+- [ ] I have read the [documentation](https://swiftpackageindex.com/SwiftyLab/MetaCodable/main/documentation/metacodable).
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.