feat: Add comprehensive content and JSON data for all topics

- Add 22 new JSON files covering all Flutter topics (1000+ questions)
- Add Firebase, CI/CD, and Clean Architecture Q&A sections
- Add DSA and Git interview questions
- Add helper files (CONTRIBUTING, INTERVIEW_TIPS, PREPARATION_ROADMAP)
- Add GitHub Actions workflow for JSON validation
- Update README with SEO optimization and better organization
- Add Python scripts for question counting and JSON validation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: mahmoodhamdi

.claude/settings.local.json

@@ -0,0 +1,14 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(dir \"D:\\Flutter-Developer-Interview-Questions\" /b)",
+      "Bash(if [ ! -d \"D:\\Flutter-Developer-Interview-Questions\\Flutter\\Firebase\" ])",
+      "Bash(then mkdir -p \"D:\\Flutter-Developer-Interview-Questions\\Flutter\\Firebase\")",
+      "Bash(else echo \"Directory exists\")",
+      "Bash(fi)",
+      "Bash(git add:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report an error in questions or answers
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: dropdown
+    id: type
+    attributes:
+      label: Issue Type
+      options:
+        - Incorrect answer
+        - Code doesn't compile
+        - Typo/Grammar error
+        - Broken link
+        - Missing information
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: file
+    attributes:
+      label: File Location
+      description: Which file has the issue?
+      placeholder: "Flutter/StateManagement/answers.md"
+    validations:
+      required: true
+
+  - type: input
+    id: question_number
+    attributes:
+      label: Question Number
+      description: Which question number (if applicable)?
+      placeholder: "15"
+    validations:
+      required: false
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What is wrong?
+      placeholder: "The code example in question 15..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested Fix
+      description: How should it be corrected?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/new_question.yml

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+name: New Question Suggestion
+description: Suggest a new interview question
+title: "[Question]: "
+labels: ["enhancement", "question"]
+body:
+  - type: dropdown
+    id: category
+    attributes:
+      label: Category
+      description: Which category does this question belong to?
+      options:
+        - Flutter - Basics
+        - Flutter - Dart
+        - Flutter - Widgets
+        - Flutter - State Management
+        - Flutter - Navigation
+        - Flutter - Animations
+        - Flutter - Networking
+        - Flutter - Architecture
+        - Flutter - Testing
+        - Flutter - Firebase
+        - Flutter - CI/CD
+        - OOP - SOLID
+        - OOP - Design Patterns
+        - DSA
+        - Git
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: difficulty
+    attributes:
+      label: Difficulty Level
+      description: How difficult is this question?
+      options:
+        - Beginner
+        - Intermediate
+        - Advanced
+    validations:
+      required: true
+
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: The interview question
+      placeholder: "What is..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: answer
+    attributes:
+      label: Suggested Answer
+      description: Your suggested answer (optional but helpful)
+      placeholder: "The answer is..."
+    validations:
+      required: false
+
+  - type: textarea
+    id: code
+    attributes:
+      label: Code Example
+      description: Any code example for the answer
+      render: dart
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: I have checked that this question doesn't already exist
+          required: true
+        - label: This question is relevant for Flutter developer interviews
+          required: true

.github/pull_request_template.md

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+## Summary
+
+<!-- Brief description of your changes -->
+
+## Type of Change
+
+- [ ] New questions
+- [ ] Answer improvements
+- [ ] Bug fix
+- [ ] Documentation update
+- [ ] JSON data update
+- [ ] Other (please describe)
+
+## Changes Made
+
+<!-- List the main changes -->
+
+-
+
+## Checklist
+
+### Content Quality
+- [ ] Questions are clear and unambiguous
+- [ ] Answers are accurate and complete
+- [ ] Code examples are tested and work correctly
+- [ ] Spelling and grammar are correct
+
+### Format
+- [ ] Questions are numbered correctly
+- [ ] Answer numbers match question numbers
+- [ ] Code blocks use correct syntax highlighting
+- [ ] Markdown formatting is correct
+
+### JSON (if applicable)
+- [ ] JSON files are valid (no syntax errors)
+- [ ] All required fields are present (id, question, answer, difficulty, tags)
+- [ ] Difficulty is one of: beginner, intermediate, advanced
+- [ ] IDs follow the format: topic_number (e.g., basics_001)
+
+## Related Issues
+
+<!-- Link any related issues: Fixes #123, Closes #456 -->
+
+## Additional Notes
+
+<!-- Any additional information for reviewers -->