feat(ssh): add comprehensive SSH course materials

[Copilot]

Overview

This PR adds comprehensive SSH (Secure Shell) course materials to the 2526 Weekly Session repository, addressing the SSH issue.

What's Added

Created a new SSH course under Contents/SSH/ with complete bilingual (English/Chinese) learning materials covering all essential SSH concepts and practical usage.

Course Content

The new SSH course (Contents/SSH/README.md) includes:

Core Topics

• SSH Fundamentals: Introduction to SSH protocol, security benefits, and common use cases
• Key Management: Generating SSH key pairs (ed25519, RSA), understanding public/private keys
• Remote Connections: Connecting to remote servers, using custom ports and keys
• Configuration: Setting up ~/.ssh/config for simplified connections
• Authentication: Adding SSH keys to remote servers and Git platforms (GitHub/GitLab)

Practical Skills

• File Transfer: Using SCP and SFTP for secure file operations
• Security Best Practices: Key management, server configuration, client security
• Advanced Features: Port forwarding, SSH tunneling, SSH agent, connection multiplexing
• Troubleshooting: Common issues and their solutions

Learning Resources

• Code examples and command references
• External documentation links
• Practice exercises for hands-on learning

Structure

Contents/SSH/
├── README.md    # Comprehensive bilingual course materials (689 lines)
└── images/      # Directory for future image assets

Compliance

• ✅ Follows repository naming conventions (PascalCase for directory: SSH)
• ✅ Includes bilingual content (English and Chinese)
• ✅ Files placed under Contents/ as per guidelines
• ✅ Created images/ directory for future assets
• ✅ No sensitive data or secrets included

Fixes #[issue-number]

Original prompt

---

This section details on the original issue you should resolve

<issue_title>SSH</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #4

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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.

[hnrobert]

可以添加一些在VSCode里ssh的操作指南