better ReadMe

[ShivamB25]

1. Add a table of contents for easy navigation.
2. Include a brief introduction section that explains what Komga is and how the Komga Cover Extractor enhances the user experience.
3. Expand the "Installation" section to include more detailed steps and clarify the requirements.
4. Refine the "Usage" section to make it more user-friendly, including a brief explanation of each argument.
5. Provide a more detailed "Examples" section with explanations of each example.
6. Update the "Future Goals" section to be more concise and clear.
7. Add a "Contributing" section to encourage community involvement.
8. Include a "License" section to inform users about the terms of use.
9. Add a "Support and Contact" section for users to know where to seek help or report issues.
10. Enhance the overall formatting for better readability, such as using bold text for section titles and bullet points for lists.