docs: add project documentation for NexusIoT production telemetry platform

Author: MrDadhich456

phase-7/README.md

@@ -0,0 +1,49 @@
+# Phase 7 — Production IoT Platform (NexusIoT)
+
+## 🏭 What I Built
+
+**NexusIoT** — A production-grade industrial IoT telemetry platform with real-time streaming, explainable anomaly detection, and full Kubernetes orchestration.
+
+🔗 **Full Project Repository:** [github.com/MrDadhich456/NexusIoT](https://github.com/MrDadhich456/NexusIoT)
+
+---
+
+## Tech Stack
+
+| Layer | Technology | Purpose |
+|-------|-----------|---------|
+| **IoT Protocol** | MQTT (Mosquitto) | Device-to-cloud messaging with QoS-1 |
+| **Message Bus** | Apache Kafka | Durable, replayable event streaming |
+| **Database** | TimescaleDB | Time-series optimised PostgreSQL |
+| **API** | FastAPI + WebSocket | REST endpoints + real-time live streams |
+| **ML/XAI** | SHAP + IsolationForest | Explainable anomaly detection |
+| **Orchestration** | Kubernetes (minikube) | Container orchestration |
+| **IaC** | Terraform | AWS infrastructure as code (free tier) |
+| **CI/CD** | GitHub Actions | Automated lint → test → build → deploy |
+| **Monitoring** | Prometheus + Grafana | Metrics, dashboards, alerting |
+
+## What I Learned
+
+- **MQTT protocol** — how IoT devices communicate with QoS guarantees
+- **Kafka as a message bus** — decoupling producers from consumers, replay capability
+- **TimescaleDB hypertables** — time-series partitioning for fast range queries
+- **WebSocket streaming** — real-time data push from Kafka to browser (<50ms)
+- **SHAP explainability** — making ML models interpretable (why was this flagged?)
+- **Kubernetes manifests** — Deployments, StatefulSets, Services, HPA, PVCs
+- **Terraform provisioning** — EC2 + security groups + IAM as code
+- **CI/CD pipelines** — multi-stage GitHub Actions with Docker Hub + SSH deploy
+- **Prometheus custom metrics** — instrumenting application code for observability
+
+## Architecture
+
+```
+Devices (MQTT) → Mosquitto → Kafka → Stream Processor → TimescaleDB
+                                          ↓                    ↓
+                                    SHAP Explainer      FastAPI + WebSocket
+                                          ↓                    ↓
+                                    Anomaly Alerts      Live Dashboard
+```
+
+## Key Differentiator
+
+Unlike typical IoT projects that just collect data, NexusIoT tells you **why** an anomaly was flagged — "spindle RPM drove 68% of this anomaly" — using SHAP explainability stored as JSONB alongside every alert.