docs: add lab2 submission

[fayz131]

Goal

Implement Lab 2: Threat modeling of OWASP Juice Shop using Threagile, including baseline analysis, secure HTTPS variant, and risk comparison

Changes

• Generated baseline Threagile threat model outputs
• Calculated Top 5 risks with composite scoring
• Created secure variant (HTTPS + storage encryption)
• Generated secure threat model outputs
• Compared baseline vs secure risk categories
• Added labs/submission2.md with full analysis

Testing

• Ran Threagile Docker container to generate baseline model
• Ran Threagile Docker container for secure variant
• Compared risks.json files using provided jq script
• Verified diagrams and reports were generated in both baseline and secure folders

Artifacts & Screenshots

• labs/submission2.md
• labs/lab2/baseline/report.pdf
• labs/lab2/secure/report.pdf
• Baseline and Secure data-flow & data-asset diagrams
• risks.json comparison (jq delta table)

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Checklist

• [☑️ ] PR title is clear and descriptive
• [ ☑️] Documentation updated if needed
• [ ☑️] No secrets, temporary files, or large binaries included