docs: add lab7 submission

[Aleliya]

Goal

Completed Lab 7 - GitOps Fundamentals by implementing reconciliation loops and health monitoring simulations to understand core GitOps principles.

Changes

• Created reconciliation script (reconcile.sh) that detects and fixes configuration drift
• Implemented health monitoring script (healthcheck.sh) using MD5 checksums for state validation
• Added combined monitoring script (monitor.sh) for continuous health checks

Testing

• Clone the repository and checkout the feature/lab7 branch
• Navigate to labs/submission7.md

Checklist:

• Clear title and description
• Documentation/README updated if needed
• No secrets or large temporary files

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• Task 1 — Git State Reconciliation
• Task 2 — GitOps Health Monitoring