Add comprehensive mentorship platforms and IT course providers guide

[Copilot]

This PR adds a dedicated resource guide for mentorship platforms and IT course providers to help IT professionals advance their careers, particularly useful for junior developers and those transitioning into tech.

What's Added

New File: mentorship-and-courses.md
A comprehensive guide organized into four main sections:

🧑‍🏫 Mentorship & Coaching Platforms

• General Tech Mentorship: MentorCruise, ADPList, Coding Coach, Ten Thousand Coffees, Plato, Stepful
• Specialized Mentorship: Springboard, CareerFoundry, Thinkful, Bloom Institute of Technology

📚 Online Course Platforms (Tech-Focused)

• Comprehensive Programming: Codecademy, freeCodeCamp, The Odin Project, Coursera, edX, Udacity
• Specialized Tech Skills: Pluralsight, LinkedIn Learning, A Cloud Guru, Kubernetes Academy, MongoDB University
• Frontend & Design: Frontend Masters, Scrimba, Design+Code, Interaction Design Foundation
• Data Science & AI: Kaggle Learn, Fast.ai, DataCamp, Coursera ML Specializations

🚀 Career-Focused Bootcamps

• Full-Stack Development: App Academy, Hack Reactor, General Assembly, Flatiron School
• Specialized Bootcamps: Metis (data science), Designlab (UX/UI), DevMountain, Ironhack
• Online Bootcamps: 42 School, Microverse, 100Devs, The Odin Project Bootcamp

💡 Additional Career Resources

• Career Coaching & Interview Prep: Pramp, InterviewBit, LeetCode, Blind
• Networking & Community: Dev.to, Stack Overflow, GitHub, Reddit communities

Key Features

• 50+ curated high-quality resources across all categories
• Free resources clearly marked with 🆓 emoji for easy identification
• Consistent formatting and emoji usage matching the existing repository style
• Cross-references between files for seamless navigation
• Resources organized by specialization and difficulty level

Updated README.md
Added a prominent reference to the new mentorship guide in the introduction section to help users discover these career growth resources.

All files have been formatted with Prettier to maintain code quality standards.

Fixes #3.

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