Improve README for clarity, structure, and onboarding

[manipratapsingh1]

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This PR improves the README.md to enhance onboarding, readability, and developer experience. The following changes have been made:

✍️ Added badges for Python version, PyPI, tests, and docs

📚 Reorganized content with a clearer Table of Contents

🚀 Improved "Getting Started" and "Installation" instructions

🧪 Added a Quick Example section for running a DQN agent

📖 Linked tutorial notebook, technical report, and documentation

💡 Enhanced "Contributing" and "Citing Acme" sections for clarity

These updates aim to help new contributors quickly understand the project’s scope and setup, while also improving the overall presentation of the repository.