Consolidate webapp structure by merging nested components into the main repository

.github/CONTRIBUTING.md

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+# Contributing to CurrenciCombo
+
+Thank you for your interest in contributing to CurrenciCombo! This document provides guidelines and instructions for contributing.
+
+## Code of Conduct
+
+This project adheres to a code of conduct. By participating, you are expected to uphold this code.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/your-username/CurrenciCombo.git`
+3. Create a branch: `git checkout -b feature/your-feature-name`
+4. Make your changes
+5. Test your changes
+6. Commit: `git commit -m "Add your feature"`
+7. Push: `git push origin feature/your-feature-name`
+8. Open a Pull Request
+
+## Development Setup
+
+See the main [README.md](../README.md) for installation and setup instructions.
+
+## Coding Standards
+
+### TypeScript/JavaScript
+- Use TypeScript for all new code
+- Follow ESLint configuration
+- Use meaningful variable and function names
+- Add JSDoc comments for public APIs
+
+### Solidity
+- Follow Solidity style guide
+- Use OpenZeppelin contracts where applicable
+- Add NatSpec comments for all functions
+- Write comprehensive tests
+
+### Git Commit Messages
+- Use clear, descriptive messages
+- Reference issue numbers when applicable
+- Format: `type(scope): description`
+
+Types:
+- `feat`: New feature
+- `fix`: Bug fix
+- `docs`: Documentation
+- `test`: Tests
+- `refactor`: Code refactoring
+- `chore`: Maintenance
+
+## Testing
+
+- Write tests for all new features
+- Run existing tests before submitting PR
+- Ensure E2E tests pass
+- Maintain test coverage above 80%
+
+## Pull Request Process
+
+1. Update documentation if needed
+2. Add tests for new functionality
+3. Ensure all tests pass
+4. Update CHANGELOG.md if applicable
+5. Request review from maintainers
+
+## Questions?
+
+Feel free to open an issue for questions or discussions.
+