chore: add issue and pull request templates (#7)

Author: thisissandipp

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: Bug Report
+description: Create a report to help us improve
+title: "fix: "
+labels: [bug]
+assignees:
+  - thisissandipp
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      placeholder: Also tell us, what did you expect to happen?
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/thisissandipp/flutter-interview-questions/blob/main/CODE_OF_CONDUCT.md).
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/new_question.yaml

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+name: New Question
+description: Propose a new Flutter interview question to be added to the repository.
+title: "question: "
+labels: [new question]
+assignees:
+  - thisissandipp
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: proposed-question
+    attributes:
+      label: Proposed Question
+      placeholder: Please write the question here.
+    validations:
+      required: true
+  - type: textarea
+    id: proposed-answer
+    attributes:
+      label: Proposed Answer
+      placeholder: If possible, provide a detailed answer, including any code snippets or explanations. This helps in drafting the final response.
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/thisissandipp/flutter-interview-questions/blob/main/CODE_OF_CONDUCT.md).
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+[Provide a brief summary of the changes introduced by this PR.]
+
+## Type of Pull Request
+
+- [ ] 🐞 Bug fix (Non-breaking change which fixes issue)
+- [ ] ✨ Feature (Non-breaking change which adds functionality)
+- [ ] 📚 Documentation update
+- [ ] 💥 New interview question/answer
+- [ ] 💡 Other... Please describe
+
+## Pull Request Checklist
+
+- [ ] 🚀 I have reviewed my own commit and ensured it follows the project's standards.
+- [ ] 📚 I have updated documentation (if necessary).
+- [ ] 🤖 I have provided clear and informative commit messages.