Redesign README.md for improved clarity and structure

[Copilot]

This PR completely redesigns the README.md file to improve clarity, navigation, and overall user experience for the Coding Resources repository.

Key Improvements

Enhanced Header and Branding

• Updated title from "CodingRessources" to "Coding Resources" (fixed typo)
• Added GitHub badges for license and last commit status
• Created a professional, consistent header design

New "About" Section

• Added comprehensive description of repository purpose and scope
• Clearly defined target audience (students, researchers, professionals in pharmacometrics)
• Listed key topics covered for quick reference

Improved Navigation

• Created a detailed Table of Contents with functional anchor links
• Organized content into clear, hierarchical sections:
  • General Knowledge
  • R Documentation & Tutorials (with subsections)
  • Pharmacokinetics Tutorials
• Added proper heading structure for better document flow

Enhanced Content Organization

• Reorganized resources under clear, descriptive section headers
• Added concise, helpful descriptions for each resource link
• Improved formatting consistency throughout the document
• Fixed spelling and grammar issues (e.g., "ressources" → "resources", "pharmaockinetics" → "pharmacokinetics")

New Contributing Section

• Added comprehensive "Contributing" section highlighting R. Garreau as maintainer
• Clearly stated repository goals and community values
• Provided specific guidance for different types of contributions
• Encouraged community participation with clear next steps

Technical Improvements

• Validated markdown syntax and structure
• Ensured all anchor links function correctly
• Improved accessibility with proper heading hierarchy
• Enhanced readability with consistent formatting

Before and After

Before: Basic list of resources with minimal organization and several typos
After: Professional, well-structured resource hub with clear navigation and comprehensive information

This redesign transforms the repository into a more professional and user-friendly resource hub that better serves the needs of students and professionals learning pharmacometric analysis and clinical study design.

This pull request was created as a result of the following prompt from Copilot chat.

Redesign the README.md file for improved clarity and structure.

Requested changes:

• Add a short "About" section at the top, summarizing the repository's purpose and audience.
• Add badges for license and last update.
• Create a clear Table of Contents with anchor links.
• Group resource links under clear, well-labeled sections (General Knowledge, R Documentation & Tutorials, Pharmacokinetics Tutorials).
• Add a "Contributing" section describing the goal of the repository and encouraging contributions. Mention that the repo is maintained by R. Garreau and is a list of very useful tutorials and tools for students and people who want to learn pharmacometric analysis and clinical study design.
• Use consistent formatting, concise descriptions, and section headers for easier navigation.

Refer to previous messages for detailed structure and content.

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