Add comprehensive documentation, CI/CD, and repository standards

[Copilot]

Repository lacked professional structure, documentation, and contribution guidelines making it difficult for students to get started and for maintainers to manage contributions.

Documentation Added

• LICENSE - MIT for educational use
• GETTING_STARTED.md - Setup instructions for C++ (g++, MinGW) and Java (JDK), compilation examples, learning paths
• CONTENT_INDEX.md - Searchable catalog of 139 C++ programs and 17 Java programs organized by topic and difficulty
• CONTRIBUTING.md - Code standards, submission process, PR template
• CODE_OF_CONDUCT.md - Academic integrity and community standards
• KNOWN_ISSUES.md - Documented folder naming inconsistency ("Leacture" vs "Lecture")
• CHANGELOG.md - Version tracking

Enhanced README

Transformed basic README into professional entry point:

• Repository badges (license, stars, forks)
• Quick links to GETTING_STARTED and CONTENT_INDEX
• Repository structure diagram
• Statistics (139 C++, 17 Java, 80+ docs)
• Setup and run examples

CI/CD

Added GitHub Actions for automated validation:

• cpp-build.yml - Compiles all C++ files with g++ (C++17)
• java-build.yml - Compiles all Java files with JDK 17
• markdown-check.yml - Validates documentation links

All workflows configured with permissions: contents: read following least-privilege security model.

Configuration

• .editorconfig - 4-space indentation for C++/Java, UTF-8, LF line endings
• .gitignore - Expanded from 33 to 150+ lines covering IDE files, build artifacts, OS-specific files

Impact

Repository now provides clear onboarding path for students, enforces code quality through automation, and follows open source best practices. All changes are additive—no breaking changes to existing structure.

Original prompt

Tell me how can i improve my repository

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.