[ADDED] copilot-instructions.md

Author: hossain-khan

.github/copilot-instructions.md

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+This is a Kotlin based repository with a JSON5 library for parsing and serializing JSON5 data. It is primarily responsible for handling configuration files and data interchange. Please follow these guidelines when contributing:
+
+[//]: # (Source: https://docs.github.com/en/enterprise-cloud@latest/copilot/using-github-copilot/coding-agent/best-practices-for-using-copilot-to-work-on-tasks)
+
+## Code Standards
+
+### Pre-setup
+Do not try to use the `./gradlew` script to run the project. Instead, use `gradle` binary directly. Use the latest Gradle version compatible with the project.
+
+### Development Flow
+- Build: `gradle build`
+- Test: `gradle check`
+
+## Repository Structure
+- `lib` - Gradle module containing the core JSON5 library code with unit tests
+- `app` - Gradle module containing the application code that uses the JSON5 library
+- `benchmark` - Gradle module for performance benchmarks
+
+## Key Guidelines
+1. Follow Kotlin best practices and idiomatic patterns
+2. Maintain existing code structure and organization
+3. Write unit tests for new functionality
+4. Update project README as needed to reflect changes